| Fact | Value | Period | Source |
|---|
| cash_and_equivalents | {"amount": 375000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2026-03-31 | esef |
| cash_and_equivalents | {"amount": 1178000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2025-03-31 | esef |
| cash_and_equivalents | {"amount": 559000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2024-03-31 | esef |
| cash_and_equivalents | {"amount": 163000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2023-03-31 | esef |
| cash_and_equivalents | {"amount": 204000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2022-03-31 | esef |
| cash_and_equivalents | {"amount": 157000000.0, "concept": "ifrs-full:CashAndCashEquivalents"} | 2021-03-31 | esef |
| current_assets | {"amount": 7485000000.0, "concept": "ifrs-full:CurrentAssets"} | 2026-03-31 | esef |
| current_assets | {"amount": 14332000000.0, "concept": "ifrs-full:CurrentAssets"} | 2025-03-31 | esef |
| current_assets | {"amount": 10379000000.0, "concept": "ifrs-full:CurrentAssets"} | 2024-03-31 | esef |
| current_assets | {"amount": 9166000000.0, "concept": "ifrs-full:CurrentAssets"} | 2023-03-31 | esef |
| current_assets | {"amount": 17963000000.0, "concept": "ifrs-full:CurrentAssets"} | 2022-03-31 | esef |
| current_assets | {"amount": 9938000000.0, "concept": "ifrs-full:CurrentAssets"} | 2021-03-31 | esef |
| current_liabilities | {"amount": 9797000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2026-03-31 | esef |
| current_liabilities | {"amount": 10621000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2025-03-31 | esef |
| current_liabilities | {"amount": 11389000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2024-03-31 | esef |
| current_liabilities | {"amount": 9130000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2023-03-31 | esef |
| current_liabilities | {"amount": 24770000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2022-03-31 | esef |
| current_liabilities | {"amount": 9368000000.0, "concept": "ifrs-full:CurrentLiabilities"} | 2021-03-31 | esef |
| entity_legal_form | {"value": "B6ES", "elf_code": "B6ES"} | | gleif |
| eps_basic | {"amount": 0.655, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2026-03-31 | esef |
| eps_basic | {"amount": 0.616, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2025-03-31 | esef |
| eps_basic | {"amount": 0.62, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2024-03-31 | esef |
| eps_basic | {"amount": 2.131, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2023-03-31 | esef |
| eps_basic | {"amount": 0.654, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2022-03-31 | esef |
| eps_basic | {"amount": 0.466, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2021-03-31 | esef |
| eps_basic | {"amount": 0.365, "concept": "ifrs-full:BasicEarningsLossPerShare"} | 2020-03-31 | esef |
| eps_diluted | {"amount": 0.652, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2026-03-31 | esef |
| eps_diluted | {"amount": 0.614, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2025-03-31 | esef |
| eps_diluted | {"amount": 0.617, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2024-03-31 | esef |
| eps_diluted | {"amount": 2.121, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2023-03-31 | esef |
| eps_diluted | {"amount": 0.65, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2022-03-31 | esef |
| eps_diluted | {"amount": 0.463, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2021-03-31 | esef |
| eps_diluted | {"amount": 0.363, "concept": "ifrs-full:DilutedEarningsLossPerShare"} | 2020-03-31 | esef |
| headquarters_address | {"city": "London", "region": null, "street": "1-3 Strand", "country": "GB", "formatted": " | | gleif |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 2247000000.0} | 2026-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 2175000000.0} | 2025-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 2061000000.0} | 2024-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 1984000000.0} | 2023-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 1830000000.0} | 2022-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 1485000000.0} | 2021-03-31 | esef |
| ifrs:AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss | {"amount": 1435000000.0} | 2020-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": -31000000.0} | 2026-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": 66000000.0} | 2025-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": -16000000.0} | 2024-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": 21000000.0} | 2023-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": -65000000.0} | 2022-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": -22000000.0} | 2021-03-31 | esef |
| ifrs:AdjustmentsForFairValueGainsLosses | {"amount": 0.0} | 2020-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -31000000.0} | 2026-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -90000000.0} | 2025-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": 31000000.0} | 2024-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -46000000.0} | 2023-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -76000000.0} | 2022-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -16000000.0} | 2021-03-31 | esef |
| ifrs:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities | {"amount": -58000000.0} | 2020-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": -127000000.0} | 2026-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": 10000000.0} | 2025-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": -154000000.0} | 2024-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": 23000000.0} | 2023-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": 140000000.0} | 2022-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": -167000000.0} | 2021-03-31 | esef |
| ifrs:AdjustmentsForProvisions | {"amount": -138000000.0} | 2020-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 45000000.0} | 2026-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 37000000.0} | 2025-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 37000000.0} | 2024-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 48000000.0} | 2023-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 38000000.0} | 2022-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 23000000.0} | 2021-03-31 | esef |
| ifrs:AdjustmentsForSharebasedPayments | {"amount": 16000000.0} | 2020-03-31 | esef |
| ifrs:Assets | {"amount": 108281000000.0} | 2026-03-31 | esef |
| ifrs:Assets | {"amount": 106742000000.0} | 2025-03-31 | esef |
| ifrs:Assets | {"amount": 98325000000.0} | 2024-03-31 | esef |
| ifrs:Assets | {"amount": 92697000000.0} | 2023-03-31 | esef |
| ifrs:Assets | {"amount": 94860000000.0} | 2022-03-31 | esef |
| ifrs:Assets | {"amount": 67216000000.0} | 2021-03-31 | esef |
| ifrs:BankOverdraftsClassifiedAsCashEquivalents | {"amount": 22000000.0} | 2022-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.365} | 2020-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.655} | 2026-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.616} | 2025-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.62} | 2024-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 2.131} | 2023-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.654} | 2022-03-31 | esef |
| ifrs:BasicEarningsLossPerShare | {"amount": 0.466} | 2021-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.37} | 2021-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.655} | 2026-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.6} | 2025-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.6} | 2024-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.742} | 2023-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.606} | 2022-03-31 | esef |
| ifrs:BasicEarningsLossPerShareFromContinuingOperations | {"amount": 0.297} | 2020-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 375000000.0} | 2026-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 1178000000.0} | 2025-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 559000000.0} | 2024-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 163000000.0} | 2023-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 204000000.0} | 2022-03-31 | esef |
| ifrs:CashAndCashEquivalents | {"amount": 157000000.0} | 2021-03-31 | esef |
| ifrs:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale | {"amount": 9000000.0} | 2023-03-31 | esef |
| ifrs:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale | {"amount": -11000000.0} | 2022-03-31 | esef |
| ifrs:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale | {"amount": -4000000.0} | 2021-03-31 | esef |
| ifrs:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale | {"amount": 0.0} | 2020-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 375000000.0} | 2026-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 1178000000.0} | 2025-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 559000000.0} | 2024-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 163000000.0} | 2023-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 182000000.0} | 2022-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 157000000.0} | 2021-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 73000000.0} | 2020-03-31 | esef |
| ifrs:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition | {"amount": 252000000.0} | 2019-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": -4620000000.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": 4528000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": 987000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": -6966000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": 8919000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": 452000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesContinuingOperations | {"amount": -1741000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": -207000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": -1150000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": 298000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations | {"amount": 135000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": -2225000000.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": 925000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": 544000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": -511000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": -11000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": -619000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings | {"amount": -562000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -4157000000.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -10593000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -7601000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": 804000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -13885000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -4939000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesContinuingOperations | {"amount": -2884000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": 22000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": 102000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": -564000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": -125000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": -177000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations | {"amount": -311000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 7829000000.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 6808000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 6939000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 6343000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 5490000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 3876000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesContinuingOperations | {"amount": 4148000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 0.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 555000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 782000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 585000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations | {"amount": 470000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 7861000000.0} | 2026-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 6991000000.0} | 2025-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 7281000000.0} | 2024-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 6432000000.0} | 2023-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 5788000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 3967000000.0} | 2021-03-31 | esef |
| ifrs:CashFlowsFromUsedInOperations | {"amount": 4240000000.0} | 2020-03-31 | esef |
| ifrs:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities | {"amount": 0.0} | 2024-03-31 | esef |
| ifrs:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities | {"amount": 0.0} | 2023-03-31 | esef |
| ifrs:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities | {"amount": 7837000000.0} | 2022-03-31 | esef |
| ifrs:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities | {"amount": 0.0} | 2021-03-31 | esef |
| ifrs:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities | {"amount": 0.0} | 2020-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 6000000.0} | 2026-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 6000000.0} | 2025-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 0.0} | 2024-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 362000000.0} | 2023-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 122000000.0} | 2022-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 81000000.0} | 2021-03-31 | esef |
| ifrs:CashPaymentsForFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 281000000.0} | 2020-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 20000000.0} | 2026-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 11000000.0} | 2025-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 123000000.0} | 2024-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 0.0} | 2023-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 17000000.0} | 2022-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 225000000.0} | 2021-03-31 | esef |
| ifrs:CashReceiptsFromFutureContractsForwardContractsOptionContractsAndSwapContractsClassifiedAsInvestingActivities | {"amount": 58000000.0} | 2020-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 3026000000.0} | 2026-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 2575000000.0} | 2025-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 1991000000.0} | 2024-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 7243000000.0} | 2023-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 4831000000.0} | 2022-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 1458000000.0} | 2021-03-31 | esef |
| ifrs:ComprehensiveIncome | {"amount": 1100000000.0} | 2020-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 4000000.0} | 2026-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 1000000.0} | 2025-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 1000000.0} | 2024-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 1000000.0} | 2023-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 2000000.0} | 2022-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": -1000000.0} | 2021-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToNoncontrollingInterests | {"amount": 2000000.0} | 2020-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToOwnersOfParent | {"amount": 3022000000.0} | 2026-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToOwnersOfParent | {"amount": 2574000000.0} | 2025-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToOwnersOfParent | {"amount": 1990000000.0} | 2024-03-31 | esef |
| ifrs:ComprehensiveIncomeAttributableToOwnersOfParent | {"amount": 7242000000.0} | 2023-03-31 | esef |