Significant Developments In The Current Reporting Period - Additional Information (Detail) - EUR (€) € in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Jan. 23, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Significant Developments In The Current Reporting Period [Abstract] | |||||
| Debt Securities Repurchased Principal Amount | € 63 | ||||
| Debt Securities Issued Principal Amount | 625 | ||||
| Cash Outflow On Repurchase Of Debt Securities | 59 | ||||
| Gain On Repurchase Recorded In Other Reserves | € 4 | ||||
| Outstanding Principal Amount Of Debt Securities | € 525 | € 525 | |||
| Insurance Claims Received Recognised In Other Income | € 164 | € 3 | |||
| Revenue recognized in IRIS 2 contract | 147 | ||||
| Termination fees for contractual commitments | € 8 | ||||