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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 906  
Carrying value, end of period $ 971   971  
Residential Mortgage        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 1,020 $ 801 906 $ 812
Additions 8 8 20 20
Servicing Asset, at fair value, purchases 4 106 134 138
Increase (decrease) in fair value, due to change in valuation inputs or assumptions (28) 45 4 41
Increase (decrease) in fair value, economic amortization associated with borrower repayments (33) (28) (93) (79)
Carrying value, end of period $ 971 $ 932 $ 971 $ 932