Servicing of Financial Assets (Analysis Of Residential MSRs Under The Fair Value Measurement Method) (Details) - USD ($) $ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Servicing Asset at Fair Value, Amount [Roll Forward] | |||||
| Carrying Value, beginning of period | $ 418 | ||||
| Carrying value, end of period | 345 | $ 418 | |||
| Residential Mortgage [Member] | |||||
| Servicing Asset at Fair Value, Amount [Roll Forward] | |||||
| Carrying Value, beginning of period | 418 | 336 | $ 324 | ||
| Additions | 42 | 111 | 64 | ||
| Increase (decrease) in fair value, due to change in valuation inputs or assumptions | (62) | 18 | (8) | ||
| Increase (decrease) in fair value, economic amortization associated with borrower repayments | [1] | (53) | (47) | (44) | |
| Carrying value, end of period | $ 345 | $ 418 | $ 336 | ||
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