Other Net Investment Result - Summary of Impairment Charges /(Reversals) (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment (losses) on financial assets, excluding receivables | € (69) | € (237) | € (119) |
| Impairment (losses) / reversals | (22) | (47) | (33) |
| Financial assets excluding receivables [member] | Debt securities and money market instruments [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment (losses) on financial assets, excluding receivables | (21) | (40) | (4) |
| Non-financial assets and receivables [member] | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairment (losses) / reversals | € (1) | € (7) | € (29) |