Investment Securities - Gains and Losses Recognized in Income from Securities (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Available-for-sale debt and other securities: | ||||
| Realized gains | $ 1 | $ 1 | $ 6 | $ 3 |
| Realized losses | (1) | 0 | (6) | 0 |
| Impairment losses | 0 | (5) | 0 | (10) |
| Net losses on available-for-sale debt and other securities | 0 | (4) | 0 | (7) |
| Equity securities: | ||||
| Net realized (losses) gains | (5) | 11 | (5) | 11 |
| Net unrealized gains (losses) | 21 | (4) | 12 | 9 |
| Net equity securities gains | 16 | 7 | 7 | 20 |
| Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities | 16 | 3 | 7 | 13 |
| Commercial Banking Revenue and Wealth and Asset Management Revenue | ||||
| Equity securities: | ||||
| Total (losses) gains recognized in income from available-for-sale debt and other securities, trading debt securities and equity securities | $ 2 | $ 0 | $ 6 | $ 2 |