Risk management - Financial assets modified (Details) - EUR (€) € in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Financial assets modified [abstract] | ||
| Financial assets with contractual cash flows modified during reporting period while loss allowance measured at lifetime expected credit losses, amortised cost before modification | € 1,746 | € 1,888 |
| Financial assets with contractual cash flows modified during reporting period while loss allowance measured at lifetime expected credit losses, modification gain (loss) | (72) | (107) |
| Financial assets with modified contractual cash flows while loss allowance measured at lifetime expected credit losses for which loss allowance changed during reporting period to 12-month expected credit losses, gross carrying amount | € 1,027 | € 1,506 |