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Servicing of Financial Assets (Analysis Of Residential and Commerical MSRs Under The Fair Value Measurement Method) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 1,007  
Carrying value, end of period $ 976   976  
Residential Mortgage        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 988 $ 1,020 1,007 $ 906
Additions 7 8 20 20
Servicing Asset, at fair value, purchases 8 4 26 134
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 1 (28) 7 4
Increase (decrease) in fair value, economic amortization associated with borrower repayments (28) (33) (84) (93)
Carrying value, end of period 976 971 976 971
Commercial Real Estate        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 93 90 97 81
Additions 3 5 8 16
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 0 (4) (1) 2
Increase (decrease) in fair value, economic amortization associated with borrower repayments (5) (4) (13) (12)
Carrying value, end of period $ 91 $ 87 $ 91 $ 87