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Servicing of Financial Assets (Analysis of Commercial Mortgage Banking Servicing Rights Under Amortized Cost) (Details) - Commercial Real Estate [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Servicing Asset at Amortized Cost, Beginning Balance $ 82 $ 86 $ 86 $ 74
Servicing Asset at Amortized Cost, Additions 4 5 9 24
Servicing Asset at Amortized Cost, Amortization (4) (4) (13) (11)
Servicing Asset at Amortized Cost, Ending Balance $ 82 $ 87 $ 82 $ 87