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Servicing of Financial Assets (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount $ 906 $ 812    
Residential Mortgage [Member]        
Servicing Assets at Fair Value [Line Items]        
Servicing related fees and other ancillary income 165 137 $ 102  
Servicing Asset at Fair Value, Amount 906 812 418 $ 296
Fannie Mae DUS License [Member]        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Amortized Cost 87 81 86  
Servicing Asset at Fair Value, Amount 109 96 96  
Commercial Real Estate [Member]        
Servicing Assets at Fair Value [Line Items]        
Servicing related fees and other ancillary income $ 23 $ 24 $ 25