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Servicing of Financial Assets (Analysis Of Residential MSRs Under The Fair Value Measurement Method) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Servicing Asset at Fair Value, Amount [Roll Forward]      
Carrying Value, beginning of period $ 812    
Carrying value, end of period 906 $ 812  
Residential Mortgage [Member]      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Carrying Value, beginning of period 812 418 $ 296
Additions 27 44 77
Servicing Asset, at fair value, purchases 158 301 72
Increase (decrease) in fair value, due to change in valuation inputs or assumptions 17 127 43
Increase (decrease) in fair value, economic amortization associated with borrower repayments (108) (78) (70)
Carrying value, end of period $ 906 $ 812 $ 418