Financial instruments carried at fair value - Recognition of trade date profit (Detail) - EUR (€) € in Millions |
6 Months Ended | |||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Financial Instruments carried at Fair Value [Abstract] | ||||
| Balance, beginning of year | € 866 | € 691 | ||
| New trades during the period | 268 | 215 | ||
| Amortization | (147) | (118) | ||
| Matured trades | (101) | (35) | ||
| Subsequent move to observability | [1] | (69) | (26) | |
| Exchange rate changes | 1 | (5) | ||
| Balance, end of period | € 818 | € 723 | ||
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