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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 906  
Carrying value, end of period $ 1,020   1,020  
Residential Mortgage        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 1,026 $ 790 906 $ 812
Additions 7 8 12 12
Servicing Asset, at fair value, purchases 5 22 130 32
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 13 8 32 (4)
Increase (decrease) in fair value, economic amortization associated with borrower repayments (31) (27) (60) (51)
Carrying value, end of period $ 1,020 $ 801 $ 1,020 $ 801