Fair Value Measurements (Rollforward For Assets And Liabilities Measured At Fair Value On A Recurring Basis With Level 3 Significant Unobservable Inputs) (Details) - USD ($) $ in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Residential Mortgage Servicing Rights [Member] | |||||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |||||
| Opening Balance | $ 296 | $ 345 | $ 418 | ||
| Gain (Loss) Included in Earnings | [1] | (27) | (157) | (115) | |
| Purchases | 149 | 108 | 42 | ||
| Closing Balance | 418 | 296 | $ 345 | ||
| Commercial Mortgage Loans Held For Sale | |||||
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | |||||
| Opening Balance | 0 | ||||
| Purchases | 47 | ||||
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Additions | 43 | ||||
| Closing Balance | $ 90 | $ 0 | |||
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