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Servicing of Financial Assets (Data And Assumptions Used In The Fair Value Calculation As Well As The Valuation's Sensitivity To Rate Fluctuations Related To Residential Mortgage Servicing Rights) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
basis_point
Jun. 30, 2020
USD ($)
basis_point
Servicing Assets at Fair Value [Line Items]    
Unpaid principal balance $ 35,519 $ 33,575
Weighted-average prepayment speed (CPR; percentage) 10.50% 17.00%
Estimated impact on fair value of a 10% increase in prepayment speed $ (27) $ (25)
Estimated impact on fair value of a 20% increase in prepayment speed $ (49) $ (44)
Option-adjusted spread (basis points) | basis_point 571 626
Estimated impact on fair value of a 10% increase in other assumptions $ (9) $ (5)
Estimated impact on fair value of a 20% increase in other assumptions $ (19) $ (11)
Weighted-average coupon interest rate 3.70% 4.10%
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life 292 months 280 months
Weighted Average Servicing Fee Basis Points | basis_point 27.3 27.4