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Fair Value Measurements - Fair Values of Assets and Liabilities (Significant Unobservable Level 3 Inputs Recurring Basis) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Derivative Assets $ 2,478   $ 1,868
Derivative liabilities (2,666)   (2,034)
Residential mortgage servicing rights      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Residential mortgage servicing rights $ 1,582 $ 1,629  
Residential mortgage servicing rights | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Prepayment speed 0.00% 0.00%  
OAS (bps) 0.0335 0.0335  
Residential mortgage servicing rights | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Prepayment speed 90.30% 100.00%  
OAS (bps) 0.1827 0.1821  
Residential mortgage servicing rights | Fixed | Weighted-Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Prepayment speed 6.80% 6.50%  
OAS (bps) 0.0376 0.0433  
Residential mortgage servicing rights | Adjustable | Weighted-Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Prepayment speed 21.10% 17.20%  
OAS (bps) 0.0702 0.0723  
IRLCs, net      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Derivative Assets $ 7 $ 7  
IRLCs, net | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Loan closing rates 0.70% 18.60%  
IRLCs, net | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Loan closing rates 99.10% 96.00%  
IRLCs, net | Weighted-Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Loan closing rates 83.90% 82.20%  
Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Derivative liabilities $ (70) $ (145)  
Swap | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Timing of the resolution of the Covered Litigation Mar. 31, 2028 Jun. 30, 2027  
Swap | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Timing of the resolution of the Covered Litigation Jun. 30, 2029 Jun. 30, 2028  
Swap | Weighted-Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Timing of the resolution of the Covered Litigation Sep. 30, 2028 Dec. 31, 2027  
Residential Mortgage      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Loans measured at FV $ 102 $ 107 $ 106
Residential Mortgage | Minimum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Interest rate risk factor (52.00%) (52.00%)  
Credit risk factor 0.00% 0.00%  
Residential Mortgage | Maximum      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Interest rate risk factor 6.70% 6.10%  
Credit risk factor 0.70% 0.80%  
Residential Mortgage | Weighted-Average      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis      
Interest rate risk factor (10.50%) (11.40%)  
Credit risk factor 0.10% 0.10%