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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
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Residential mortgage servicing rights at fair value $ 932   $ 932     $ 812    
Residential Mortgage [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                
Residential mortgage servicing rights at fair value 932 $ 809 932 $ 809 $ 801 $ 812 $ 770 $ 418
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 17 5 (38) 72        
Additions 8 9 20 38        
Servicing Asset, at fair value, purchases $ 106 $ 25 $ 138 $ 281