v3.22.4
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, 2022
Dec. 31, 2021
Dec. 31, 2020
Residential Mortgage [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings $ 49 $ (27) $ (157)
Additions 44 77 49
Servicing Asset, at fair value, purchases 301 72 59
Commercial Mortgage Loans Held For Sale      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Opening Balance 90 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (8) 0  
FairValueMeasurementWithUnobservableInputsReconcilitionRecurringBasisAssetPurchases 0 47  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Additions 108 43  
FairValueMeasurementWithUnonservableInputsReconciliationRecurring BasisAssetSales (125) 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (46) 0  
Closing Balance $ 19 $ 90 $ 0