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Derivatives and hedge accounting - Maturity derivatives designated in cash flow hedging (Details) - Derivatives - Cash flow hedges - Net payer and receiver swap number in Millions | Dec. 31, 2023 | Dec. 31, 2022
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– Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (49,300) | (50,300)
– Interest rate swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (214) | (562)
– Interest rate swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 184 | (935)
– Interest rate swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (8,557) | (6,730)
– Interest rate swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (18,551) | (12,464)
– Interest rate swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (6,636) | (8,926)
– Interest rate swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (7,246) | (8,115)
– Interest rate swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (4,896) | (3,620)
– Interest rate swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (3,384) | (8,947)
– Cross currency swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (362) |
– Cross currency swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  |
– Cross currency swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 249 |
– Cross currency swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 1,029 |
– Cross currency swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (932) |
– Cross currency swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 503 |
– Cross currency swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (683) |
– Cross currency swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 167 |
– Cross currency swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (693) |
– Cross currency interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (2,736) | (5,323)
– Cross currency interest rate swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  |
– Cross currency interest rate swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  | (834)
– Cross currency interest rate swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  | (1,535)
– Cross currency interest rate swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (24) | (721)
– Cross currency interest rate swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (1,232) | (2,140)
– Cross currency interest rate swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (1,479) | (52)
– Cross currency interest rate swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  | 7
– Cross currency interest rate swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  | (48)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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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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