Financial Assets/Liabilities at Fair Value through Profit or Loss - Excess of the Contractual Amount Repayable at Maturity over the Carrying Value of Financial Liabilities (Detail) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Financial Assets/Liabilities at Fair Value through Profit or Loss [Abstract] | ||||||
| Including undrawn loan commitments | [1],[2] | € 355 | € 1,085 | |||
| Excluding undrawn loan commitments | [1] | € 106 | € 497 | |||
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