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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period     $ 1,007  
Carrying value, end of period $ 988   988  
Residential Mortgage        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 979 $ 1,026 1,007 $ 906
Additions 7 7 12 12
Servicing Asset, at fair value, purchases 14 5 19 130
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 16 13 6 32
Increase (decrease) in fair value, economic amortization associated with borrower repayments (28) (31) (56) (60)
Carrying value, end of period 988 1,020 988 1,020
Commercial Real Estate        
Servicing Asset at Fair Value, Amount [Roll Forward]        
Carrying Value, beginning of period 94 88 97 81
Additions 2 5 4 11
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 1 2 0 6
Increase (decrease) in fair value, economic amortization associated with borrower repayments (4) (5) (8) (8)
Carrying value, end of period $ 93 $ 90 $ 93 $ 90