v3.25.2
Fair Values of Assets and Liabilities - Changes in Fair Value for Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Beginning of Period Balance $ (727) $ (2,361) $ (1,800) $ (1,885)  
Net Gains (Losses) Included in Net Income 10 (1,004) (181) (2,687)  
Purchases 52 270 721 648  
Sales 0 (3) (2) (5)  
Issuances 0 0 1 0  
Settlements 558 795 1,154 1,626  
End of Period Balance (107) (2,303) (107) (2,303)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period 463 4 1,351 (676)  
Available-for-sale securities [1] 90,577   90,577   $ 85,992
Mortgage servicing rights          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning of Period Balance 3,312 3,462 3,369 3,377  
Net Gains (Losses) Included in Net Income (71) (12) (188) 18  
Purchases 0 1 0 1  
Sales 0 (189) 1 (189)  
Issuances 64 64 123 119  
Settlements 0 0 0 0  
End of Period Balance 3,305 3,326 3,305 3,326  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (71) (12) (188) 18  
Mortgage Banking Revenue          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income 53 52 104 96  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period 21 17 21 17  
Commercial Products Revenue          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income 39 (1,000) (202) (2,700)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period 526 (19) 1,400 (624)  
Other Noninterest Income          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income (82) 6 (83) (69)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period $ (82) $ 6 $ (83) $ (69)  
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.