Servicing of Financial Assets (Analysis Of Residential MSRs Under The Fair Value Measurement Method) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||
| Carrying Value, beginning of period | $ 345 | ||
| Carrying value, end of period | 296 | $ 345 | |
| Residential Mortgage [Member] | |||
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||
| Carrying Value, beginning of period | 345 | 418 | $ 336 |
| Additions | 108 | 42 | 111 |
| Increase (decrease) in fair value, due to change in valuation inputs or assumptions | (89) | (62) | 18 |
| Increase (decrease) in fair value, economic amortization associated with borrower repayments | (68) | (53) | (47) |
| Carrying value, end of period | $ 296 | $ 345 | $ 418 |