CIK 0000938323 · QID Q1916402
| Fakt | Wert | Zeit | Quelle |
|---|---|---|---|
| common_shares_outstanding | {"unit": "shares", "value": 635814880, "concept": "dei:EntityCommonStockSharesOutstanding" | 2025-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 666264831, "concept": "dei:EntityCommonStockSharesOutstanding" | 2024-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 697298680, "concept": "dei:EntityCommonStockSharesOutstanding" | 2023-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 715733241, "concept": "dei:EntityCommonStockSharesOutstanding" | 2022-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 756802797, "concept": "dei:EntityCommonStockSharesOutstanding" | 2021-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 753257638, "concept": "dei:EntityCommonStockSharesOutstanding" | 2020-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 782098929, "concept": "dei:EntityCommonStockSharesOutstanding" | 2019-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 781078167, "concept": "dei:EntityCommonStockSharesOutstanding" | 2018-12-31 | sec_edgar |
| common_shares_outstanding | {"unit": "shares", "value": 802053752, "concept": "dei:EntityCommonStockSharesOutstanding" | 2017-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 635814880} | 2025-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 666264831} | 2024-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 697298680} | 2023-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 715733241} | 2022-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 756802797} | 2021-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 753257638} | 2020-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 782098929} | 2019-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 781078167} | 2018-12-31 | sec_edgar |
| dei:EntityCommonStockSharesOutstanding | {"unit": "shares", "value": 802053752} | 2017-12-31 | sec_edgar |
| industry_sic | {"code": "2731", "scheme": "SIC", "description": "Books: Publishing or Publishing & Print | sec_edgar | |
| xbrl:Accruals | {"unit": "GBP", "value": 317000000} | 2021-12-31 | sec_edgar |
| xbrl:Accruals | {"unit": "GBP", "value": 290000000} | 2020-12-31 | sec_edgar |
| xbrl:Accruals | {"unit": "GBP", "value": 295000000} | 2019-12-31 | sec_edgar |
| xbrl:Accruals | {"unit": "GBP", "value": 397000000} | 2018-12-31 | sec_edgar |
| xbrl:Accruals | {"unit": "GBP", "value": 447000000} | 2017-12-31 | sec_edgar |
| xbrl:Accruals | {"unit": "GBP", "value": 507000000} | 2016-12-31 | sec_edgar |
| xbrl:AccrualsClassifiedAsNoncurrent | {"unit": "GBP", "value": 1000000} | 2021-12-31 | sec_edgar |
| xbrl:AccrualsClassifiedAsNoncurrent | {"unit": "GBP", "value": 15000000} | 2018-12-31 | sec_edgar |
| xbrl:AccrualsClassifiedAsNoncurrent | {"unit": "GBP", "value": 26000000} | 2017-12-31 | sec_edgar |
| xbrl:AccrualsClassifiedAsNoncurrent | {"unit": "GBP", "value": 17000000} | 2016-12-31 | sec_edgar |
| xbrl:AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination | {"unit": "GBP", "value": 0} | 2015-12-31 | sec_edgar |
| xbrl:AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill | {"unit": "GBP", "value": 53000000} | 2019-12-31 | sec_edgar |
| xbrl:AcquisitionsThroughBusinessCombinationsOtherProvisions | {"unit": "GBP", "value": 1000000} | 2025-12-31 | sec_edgar |
| xbrl:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases | {"value": 0.034} | 2020-12-31 | sec_edgar |
| xbrl:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases | {"value": 0.035} | 2019-12-31 | sec_edgar |
| xbrl:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases | {"value": 0.038} | 2018-12-31 | sec_edgar |
| xbrl:ActuarialAssumptionOfExpectedRatesOfSalaryIncreases | {"value": 0.037} | 2017-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 9000000} | 2025-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 24000000} | 2024-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 18000000} | 2023-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 87000000} | 2022-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 46000000} | 2021-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 16000000} | 2020-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 77000000} | 2019-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 106000000} | 2018-12-31 | sec_edgar |
| xbrl:AdditionalProvisionsOtherProvisions | {"unit": "GBP", "value": 4000000} | 2017-12-31 | sec_edgar |
| xbrl:AdditionsToNoncurrentAssets | {"unit": "GBP", "value": 262000000} | 2019-12-31 | sec_edgar |
| xbrl:AdditionsToNoncurrentAssets | {"unit": "GBP", "value": 196000000} | 2018-12-31 | sec_edgar |
| xbrl:AdditionsToNoncurrentAssets | {"unit": "GBP", "value": 240000000} | 2017-12-31 | sec_edgar |
| xbrl:AdditionsToNoncurrentAssets | {"unit": "GBP", "value": 246000000} | 2016-12-31 | sec_edgar |
| xbrl:AdditionsToNoncurrentAssets | {"unit": "GBP", "value": 243000000} | 2015-12-31 | sec_edgar |
| xbrl:AdditionsToRightofuseAssets | {"unit": "GBP", "value": 51000000} | 2025-12-31 | sec_edgar |
| xbrl:AdditionsToRightofuseAssets | {"unit": "GBP", "value": 46000000} | 2024-12-31 | sec_edgar |
| xbrl:AdditionsToRightofuseAssets | {"unit": "GBP", "value": 42000000} | 2023-12-31 | sec_edgar |
| xbrl:AdditionsToRightofuseAssets | {"unit": "GBP", "value": 49000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 660300000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 684000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 717300000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 742000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 759100000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 755400000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 777500000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 778700000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 813700000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 814800000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustedWeightedAverageShares | {"unit": "shares", "value": 813300000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 117000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 112000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 115000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 88000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 85000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 84000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForAmortisationExpense | {"unit": "GBP", "value": 74000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": 6000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -60000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -20000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -18000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": 12000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -4000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -21000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -34000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": 2000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -27000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForCurrentTaxOfPriorPeriod | {"unit": "GBP", "value": -42000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInFinancialAssetsHeldForTrading | {"unit": "GBP", "value": 13000000} | 2018-01-01 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 5000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 15000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 9000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": -34000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 22000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 35000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": -20000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": -10000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 24000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 17000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInInventories | {"unit": "GBP", "value": 10000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -104000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 32000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -24000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 33000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -71000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -1000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 59000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -15000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 170000000} | 2018-01-01 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 133000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": 156000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables | {"unit": "GBP", "value": -99000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 50000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 80000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 151000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 99000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 138000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 2733000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"unit": "GBP", "value": 1051000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 241000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 125000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 123000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 66000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 90000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 95000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForDepreciationExpense | {"unit": "GBP", "value": 75000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 50000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 31000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 5000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": -52000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 6000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 31000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 43000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 55000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 30000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 60000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForFinanceCosts | {"unit": "GBP", "value": 29000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 61000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 182000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 9000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 315000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 116000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": 40000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates | {"unit": "GBP", "value": -1194000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 1000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories | {"unit": "GBP", "value": 0} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment | {"unit": "GBP", "value": 25000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment | {"unit": "GBP", "value": 0} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment | {"unit": "GBP", "value": 11000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": -3000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": 44000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": -34000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": -92000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": 13000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": -222000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncomeTaxExpense | {"unit": "GBP", "value": -24000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": 6000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": -1000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": 5000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": -9000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": -232000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": -106000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"unit": "GBP", "value": -57000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInFinancialLiabilitiesHeldForTrading | {"unit": "GBP", "value": 13000000} | 2018-01-01 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 35000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -99000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -20000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -84000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 37000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -26000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -157000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 35000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 182000000} | 2018-01-01 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 6000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": 61000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables | {"unit": "GBP", "value": -80000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": 14000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": -37000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": 49000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": 63000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": -11000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": -10000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForProvisions | {"unit": "GBP", "value": -13000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 39000000} | 2025-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 44000000} | 2024-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 40000000} | 2023-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 35000000} | 2022-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 28000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 29000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 25000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 37000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 33000000} | 2017-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 22000000} | 2016-12-31 | sec_edgar |
| xbrl:AdjustmentsForSharebasedPayments | {"unit": "GBP", "value": 26000000} | 2015-12-31 | sec_edgar |
| xbrl:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod | {"unit": "GBP", "value": 1000000} | 2021-12-31 | sec_edgar |
| xbrl:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod | {"unit": "GBP", "value": 5000000} | 2020-12-31 | sec_edgar |
| xbrl:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod | {"unit": "GBP", "value": 54000000} | 2019-12-31 | sec_edgar |
| xbrl:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod | {"unit": "GBP", "value": 44000000} | 2018-12-31 | sec_edgar |
| xbrl:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod | {"unit": "GBP", "value": 78000000} | 2017-12-31 | sec_edgar |