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Fair Value Measurements - Reconciliation of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Balance, beginning of period $ 1,603 $ 1,599 $ 1,581 $ 1,639  
Included in earnings (19) (38) (34) (89)  
Purchases/originations/acquisitions 35 15 47 24  
Settlements (7) 16 16 17  
Transfers into Level 3 0 1 2 2  
Balance, end of period 1,612 1,593 1,612 1,593  
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held (2) (19) (10) (68)  
Derivative Assets 2,478   2,478   $ 1,868
Derivative Liabilities 2,666   2,666   $ 2,034
Unrealized gains or losses included in other comprehensive income for instruments still held   0 0 0  
Interest rate contracts | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Derivative Assets 7 7 7 7  
Derivative Liabilities 9 5 9 5  
Residential Mortgage Servicing Rights          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Balance, beginning of period 1,583 1,663 1,598 1,704  
Included in earnings (36) (49) (74) (100)  
Purchases/originations/acquisitions 35 15 58 25  
Settlements 0 0 0 0  
Transfers into Level 3 0 0 0 0  
Balance, end of period 1,582 1,629 1,582 1,629  
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held (9) (26) (25) (60)  
Interest rate contracts          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Balance, beginning of period (3) 0 1 (3)  
Included in earnings 18 12 34 27  
Purchases/originations/acquisitions 0 0 (6) (1)  
Settlements (17) (10) (31) (21)  
Transfers into Level 3 0 0 0 0  
Balance, end of period (2) 2 (2) 2  
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held 8 8 9 8  
Equity Derivatives          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Balance, beginning of period (82) (173) (124) (170)  
Included in earnings (1) (1) 7 (19)  
Purchases/originations/acquisitions 0 0 (5) 0  
Settlements 13 29 52 44  
Transfers into Level 3 0 0 0 0  
Balance, end of period (70) (145) (70) (145)  
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held (1) (1) 7 (19)  
Residential Mortgage Loans          
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation          
Balance, beginning of period 105 109 106 108  
Included in earnings 0 0 (1) 3  
Purchases/originations/acquisitions 0 0 0 0  
Settlements (3) (3) (5) (6)  
Transfers into Level 3 0 1 2 2  
Balance, end of period 102 107 102 107  
The amount of total (losses) gains for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held $ 0 $ 0 $ (1) $ 3