Debt Securities (Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Investments, Debt and Equity Securities [Abstract] | ||||
| Gross realized gains | $ 0 | $ 0 | $ 2 | $ 1 |
| Gross realized losses | 41 | 1 | 46 | 27 |
| Securities gains (losses), net | $ (41) | $ (1) | $ (44) | $ (26) |