Servicing of Financial Assets (Analysis of Commercial DUS Mortgage Banking Servicing Rights Under Amortized Cost) (Details) - Other contracts - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Servicing Asset at Fair Value, Amount [Roll Forward] | ||||
| Servicing Asset at Amortized Cost, Beginning Balance | $ 86 | $ 91 | $ 89 | $ 90 |
| Additions | 0 | 5 | 2 | 10 |
| Servicing Asset at Amortized Cost, Period Increase (Decrease) | (4) | (5) | (9) | (9) |
| Servicing Asset at Amortized Cost, Ending Balance | $ 82 | $ 91 | $ 82 | $ 91 |