Financial Risks - Summary of Reconciliation of the Loss Allowance Movements with an Impact on the Income Statement with the Net Impairment Charge (Detail) - EUR (€) € in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of financial assets measured at amortized cost [Line Items] | |||
| Impairment charge in P&L | € (69) | € (237) | € (119) |
| Other [member] | |||
| Disclosure of financial assets measured at amortized cost [Line Items] | |||
| Impairment charge in P&L | (6) | (9) | |
| Measured at amortized cost [member] | Loans measured at amortized cost [member] | |||
| Disclosure of financial assets measured at amortized cost [Line Items] | |||
| Impairment charge in P&L | 57 | (88) | |
| Measured at amortized cost [member] | Debt securities measured at FVOCI [member] | |||
| Disclosure of financial assets measured at amortized cost [Line Items] | |||
| Impairment charge in P&L | € (120) | € (140) | |