Servicing of Financial Assets (Narrative) (Details) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Servicing Assets at Fair Value [Line Items] | ||||
| Servicing Asset at Fair Value, Amount | $ 906 | $ 812 | ||
| Residential Mortgage [Member] | ||||
| Servicing Assets at Fair Value [Line Items] | ||||
| Servicing related fees and other ancillary income | 165 | 137 | $ 102 | |
| Servicing Asset at Fair Value, Amount | 906 | 812 | 418 | $ 296 |
| Fannie Mae DUS License [Member] | ||||
| Servicing Assets at Fair Value [Line Items] | ||||
| Servicing Asset at Amortized Cost | 87 | 81 | 86 | |
| Servicing Asset at Fair Value, Amount | 109 | 96 | 96 | |
| Commercial Real Estate [Member] | ||||
| Servicing Assets at Fair Value [Line Items] | ||||
| Servicing related fees and other ancillary income | $ 23 | $ 24 | $ 25 | |