Servicing of Financial Assets (Analysis of Commercial Mortgage Banking Servicing Rights Under Amortized Cost) (Details) - Commercial Real Estate [Member] - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| ServicingCommercialMortgageTable [Line Items] | |||
| Servicing Asset at Amortized Cost, Beginning Balance | $ 74 | $ 59 | $ 56 |
| Servicing Asset at Amortized Cost, Additions | 29 | 25 | 13 |
| Servicing Asset at Amortized Cost, Amortization | (17) | (10) | (10) |
| Servicing Asset at Amortized Cost, Ending Balance | $ 86 | $ 74 | $ 59 |