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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 812  
Carrying value, end of period $ 801   801  
Residential Mortgage [Member]        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 790 $ 542 812 $ 418
Additions 8 10 12 29
Servicing Asset, at fair value, purchases 22 181 32 256
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 8 52 (4) 99
Increase (decrease) in fair value, economic amortization associated with borrower repayments (27) (15) (51) (32)
Carrying value, end of period $ 801 $ 770 $ 801 $ 770