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Risk management - Derivative financial instruments to transition to alternative benchmarks (Details) | Dec. 31, 2023 | Dec. 31, 2022
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Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks |  |
Disclosure Of Financial Instrument Exposure [Line Items] |  |
Nominal value | 77,388,000,000 | 631,636,000,000
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | USD LIBOR |  |
Disclosure Of Financial Instrument Exposure [Line Items] |  |
Nominal value | 151,000,000 | 495,318,000,000
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | WIBOR |  |
Disclosure Of Financial Instrument Exposure [Line Items] |  |
Nominal value | 77,238,000,000 | 136,318,000,000
Swaption | USD LIBOR ICE Swap Rate |  |
Disclosure Of Financial Instrument Exposure [Line Items] |  |
Nominal value |  | 10,810,000,000

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- Definition The nominal amount of a hedging instrument. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 23B -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_23B_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24A -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24A_d&doctype=Standard -URIDate 2023-03-23 + Details
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