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, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| ServicingCommercialMortgageTable [Line Items] | ||||
| Servicing Asset at Amortized Cost, Beginning Balance | $ 91 | $ 85 | $ 90 | $ 87 |
| Additions | 5 | 4 | 10 | 6 |
| Servicing Asset at Amortized Cost, Period Increase (Decrease) | (5) | (4) | (9) | (8) |
| Servicing Asset at Amortized Cost, Ending Balance | $ 91 | $ 85 | $ 91 | $ 85 |