Basis of preparation and material accounting policy information - Reconciliation shareholders' equity under IFRS-EU and IFRS-IASB (Details) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of Reconciliation Shareholder Equity EU IFRS and IASB IFRS [Abstract] | |||
| In accordance with IFRS-EU (attributable to the shareholders of the parent) | € 49,698 | € 50,314 | € 51,240 |
| Adjustment of the EU IAS 39 carve-out | 6,022 | 3,378 | 4,902 |
| Tax effect of the adjustment | (1,636) | (989) | (1,457) |
| Effect of adjustment after tax | 4,386 | 2,389 | 3,444 |
| In accordance with IFRS-IASB Shareholders’ equity | € 54,083 | € 52,703 | € 54,684 |