Basis of preparation and material accounting policy information - Reconciliation net result under IFRS-EU and IFRS-IASB (Details) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of Reconciliation Net Result EU IFRS and IASB IFRS [Abstract] | |||
| In accordance with IFRS-EU (attributable to the shareholders of the parent) | € 6,327 | € 6,392 | € 7,287 |
| Adjustment of the EU IAS 39 carve-out | 2,643 | (1,528) | (4,455) |
| Tax effect of the adjustment | (647) | 470 | 1,308 |
| Effect of adjustment after tax | 1,996 | (1,058) | (3,147) |
| Shareholders of the parent | € 8,324 | € 5,334 | € 4,140 |