Segment information - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Segment Reporting [Abstract] | ||||
| Taxable-equivalent adjustment | $ 9 | $ 13 | $ 21 | $ 25 |