Unearned revenue liability (URL Rollforward) (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Insurance [Abstract] | ||
| Balance – beginning of period | $ 758 | $ 711 |
| Deferred revenue | 61 | 69 |
| Amortization | (40) | (38) |
| Other (including foreign exchange) | (7) | 11 |
| Balance – end of period | $ 772 | $ 753 |