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Derivatives and hedge accounting - Maturity derivatives designated in fair value hedging (Details) - Interest rate risk - - fair value 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 | 46,471 | 54,523
– Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (1,797) | (1,669)
Less than 1 month | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (670) | (15)
Less than 1 month | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value |  | (10)
1 to 3 months | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 623 | 1,295
1 to 3 months | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (42) | (55)
3 to 12 months | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 4,648 | 5,744
3 to 12 months | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (183) | (190)
1 to 2 years | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 9,482 | 5,727
1 to 2 years | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (361) | (260)
2 to 3 years | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 13,201 | 9,526
2 to 3 years | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (263) | (415)
3 to 4 years | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 7,224 | 9,153
3 to 4 years | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (230) | (216)
4 to 5 years | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 10,164 | 6,638
4 to 5 years | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (277) | (228)
>5 years | – Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | 1,798 | 16,454
>5 years | – Other interest derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal value | (442) | (296)

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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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