v3.26.1
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, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Beginning of Period Balance $ 490 $ (727) $ (212) $ (1,800)  
Net Gains (Losses) Included in Net Income (1,594) 10 (1,751) (181)  
Purchases 629 52 1,029 721  
Sales (7) 0 (7) (2)  
Issuances 0 0 0 1  
Settlements 231 558 690 1,154  
End of Period Balance (251) (107) (251) (107)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (622) 463 (136) 1,351  
Available-for-sale securities [1] 89,085   89,085   $ 90,838
Mortgage servicing rights          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning of Period Balance 3,152 3,312 3,159 3,369  
Net Gains (Losses) Included in Net Income (58) (71) (129) (188)  
Purchases 0 0 0 0  
Sales (2) 0 (4) 1  
Issuances 85 64 151 123  
Settlements 0 0 0 0  
End of Period Balance 3,177 3,305 3,177 3,305  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (58) (71) (129) (188)  
Income Statement Location [Axis]: us-gaap:FeesAndCommissionsMortgageBankingAndServicing          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income 51 53 95 104  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period 16 21 16 21  
Income Statement Location [Axis]: us-gaap:NoninterestIncomeOtherOperatingIncome          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income (13) (82) (31) (83)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period (13) (82) (31) (83)  
Income Statement Location [Axis]: usb:CapitalMarketsRevenue          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]          
Net Gains (Losses) Included in Net Income (1,600) 39 (1,800) (202)  
Net Change in Unrealized Gains (Losses) Relating to Assets and Liabilities Held at End of Period $ (625) $ 526 $ (121) $ 1,400  
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.