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Servicing of Financial Assets (Analysis Of Residential MSRs Under The Fair Value Measurement Method) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 812  
Carrying value, end of period $ 932   932  
Residential Mortgage [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 801 $ 770 812 $ 418
Additions 8 9 20 38
Servicing Asset, at fair value, purchases 106 25 138 281
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 45 28 41 127
Increase (decrease) in fair value, economic amortization associated with borrower repayments (28) (23) (79) (55)
Carrying value, end of period $ 932 $ 809 $ 932 $ 809