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Derivatives and hedge accounting - Cash flow hedging - impact of hedging instruments on the statement of profit or loss and other comprehensive income (Detail) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
– Discontinued hedges |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) |  |
– Discontinued hedges | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  | 194
Amount reclassified from CFH reserve to profit or loss |  | (150)
– Discontinued hedges | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  |
Amount reclassified from CFH reserve to profit or loss |  | (1)
- Derivatives | Cash flow hedges |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | (550) | (1,778)
Carrying amount cash flow hedge reserve at the end of the reporting period | (2,614) | (3,157)
Amount reclassified from CFH reserve to profit or loss | (209) | (325)
Change in value of hedging instrument recognised in OCI for the period | 743 | 1,922
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) | 35 | 48
- Derivatives | Cash flow hedges | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | (553) | (1,760)
Carrying amount cash flow hedge reserve at the end of the reporting period | (2,635) | (3,200)
Amount reclassified from CFH reserve to profit or loss | 20 | (57)
Change in value of hedging instrument recognised in OCI for the period | 526 | 1,654
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) | 39 | 58
- Derivatives | Cash flow hedges | – Cross currency swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | (67) | 2
Carrying amount cash flow hedge reserve at the end of the reporting period | (51) | (35)
Amount reclassified from CFH reserve to profit or loss | (162) | (223)
Change in value of hedging instrument recognised in OCI for the period | 220 | 200
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) | (3) | (12)
- Derivatives | Cash flow hedges | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | 70 | (20)
Carrying amount cash flow hedge reserve at the end of the reporting period | 72 | 78
Amount reclassified from CFH reserve to profit or loss | (68) | (46)
Change in value of hedging instrument recognised in OCI for the period | (3) | 68
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) | (2) | 2
- Derivatives | – Discontinued hedges | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount cash flow hedge reserve at the end of the reporting period | 89 |
Amount reclassified from CFH reserve to profit or loss | (51) |
- Derivatives | – Discontinued hedges | – Cross currency swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  | 7
Amount reclassified from CFH reserve to profit or loss | (4) | (5)
- Derivatives | – Discontinued hedges | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  |
Amount reclassified from CFH reserve to profit or loss |  |
Lending | Floating rate | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | (668) | (2,694)
Carrying amount cash flow hedge reserve at the end of the reporting period | (2,850) | (3,545)
Amount reclassified from CFH reserve to profit or loss | 496 | 590
Lending | Floating rate | – Cross currency swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | (79) | 27
Carrying amount cash flow hedge reserve at the end of the reporting period | (55) | (42)
Amount reclassified from CFH reserve to profit or loss | (121) | (185)
Lending | Floating rate | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | 70 | (20)
Carrying amount cash flow hedge reserve at the end of the reporting period | 72 | 78
Amount reclassified from CFH reserve to profit or loss | (68) | (46)
Borrowings | Floating rate | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | 114 | 933
Carrying amount cash flow hedge reserve at the end of the reporting period | 125 | 151
Amount reclassified from CFH reserve to profit or loss | (425) | (497)
Borrowings | Floating rate | – Cross currency swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | 12 | (25)
Carrying amount cash flow hedge reserve at the end of the reporting period | 5 | 1
Amount reclassified from CFH reserve to profit or loss | (37) | (33)
Borrowings | Floating rate | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  |
Amount reclassified from CFH reserve to profit or loss |  | 1
Other | – Cross currency swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  |
Amount reclassified from CFH reserve to profit or loss |  |
Other | – Cross currency interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period |  |
Carrying amount cash flow hedge reserve at the end of the reporting period |  |
Amount reclassified from CFH reserve to profit or loss |  |
Other | Cash flow hedges | – Interest rate swaps |  |
Disclosure of detailed information about hedged items [line items] |  |
Change in value of hedged item used for calculating hedge ineffectiveness for the period | 1 |
Carrying amount cash flow hedge reserve at the end of the reporting period | 1 |
Amount reclassified from CFH reserve to profit or loss |  |

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- Definition The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of reclassification adjustments related to cash flow hedges, before tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 92 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_92&doctype=Standard -URIDate 2024-03-27 + Details
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