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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Servicing Asset at Amortized Cost, Balance [Roll Forward]        
Servicing Asset at Amortized Cost, Beginning Balance $ 82 $ 59 $ 74 $ 59
Servicing Asset at Amortized Cost, Additions 8 7 19 10
Servicing Asset at Amortized Cost, Amortization (4) (2) (7) (5)
Servicing Asset at Amortized Cost, Ending Balance $ 86 $ 64 $ 86 $ 64