v3.26.1
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 and Commercial Mortgage Servicing Rights) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
basis_point
Mar. 31, 2025
USD ($)
basis_point
Residential Mortgage    
Servicing Assets at Fair Value [Line Items]    
Unpaid principal balance $ 63,746 $ 67,771
Weighted-average CPR (%) 7.50% 7.70%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed $ (37) $ (36)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed $ (70) $ (70)
Option-adjusted spread (basis points) | basis_point 496 533
Estimated impact on fair value of a 10% increase $ (21) $ (23)
Estimated impact on fair value of a 20% increase $ (43) $ (47)
Weighted-Average Coupon Interest Rate 3.90% 3.80%
Weighted-average remaining maturity (months) 287 months 294 months
Weighted-average servicing fee (basis points) | basis_point 27.7 27.3
Commercial Real Estate    
Servicing Assets at Fair Value [Line Items]    
Unpaid principal balance $ 8,338 $ 7,544
Weighted-average CPR (%) 7.60% 7.10%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed $ (2) $ (1)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed $ (3) $ (3)
Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate 8.20% 8.20%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Other Assumption $ (3) $ (3)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Other Assumption $ (5) $ (5)
Weighted-Average Coupon Interest Rate 4.90% 4.70%
Weighted-average remaining maturity (months) 142 months 146 months
Weighted-average servicing fee (basis points) | basis_point 24.3 25.7