Fair value of assets and liabilities - Deferred day one profit or loss reserve (Details) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of fair value measurement of assets and liabilities [Line Items] | ||
| Opening balance at 1 January | € (94) | € (90) |
| DOP deferred on new transactions during the period | (37) | (62) |
| Closing balance at 31 December | (91) | (94) |
| of which release | ||
| Disclosure of fair value measurement of assets and liabilities [Line Items] | ||
| DOP recognised in the statement of profit or loss during the period: | 13 | 27 |
| of which amortisation and exchange differences | ||
| Disclosure of fair value measurement of assets and liabilities [Line Items] | ||
| DOP recognised in the statement of profit or loss during the period: | € 27 | € 32 |