Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Maturities by Category of Collateral Pledged for Repurchase Agreements and Securities Loaned Transactions (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 60,343	$ 57,944
Securities loaned	119	84
Gross amount of recognized liabilities	60,462	58,028
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	59,316	57,844
Securities loaned	119	84
Gross amount of recognized liabilities	59,435	57,928
Less Than 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	668	100
Securities loaned	0	0
Gross amount of recognized liabilities	668	100
30-89 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Securities loaned	0	0
Gross amount of recognized liabilities	0	0
Greater Than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	359	0
Securities loaned	0	0
Gross amount of recognized liabilities	359	0
U.S. Treasury and agencies
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	54,981	54,117
U.S. Treasury and agencies \| Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	54,115	54,117
U.S. Treasury and agencies \| Less Than 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	507	0
U.S. Treasury and agencies \| 30-89 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
U.S. Treasury and agencies \| Greater Than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	359	0
Residential mortgage-backed securities \| Agency
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	316	293
Residential mortgage-backed securities \| Overnight and Continuous \| Agency
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	316	293
Residential mortgage-backed securities \| Less Than 30 Days \| Agency
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Residential mortgage-backed securities \| 30-89 Days \| Agency
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Residential mortgage-backed securities \| Greater Than 90 Days \| Agency
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Corporate debt securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	4,680	3,115
Securities loaned	119	84
Corporate debt securities \| Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	4,519	3,015
Securities loaned	119	84
Corporate debt securities \| Less Than 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	161	100
Securities loaned	0	0
Corporate debt securities \| 30-89 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Securities loaned	0	0
Corporate debt securities \| Greater Than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Securities loaned	0	0
Asset-backed securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	366	419
Asset-backed securities \| Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	366	419
Asset-backed securities \| Less Than 30 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Asset-backed securities \| 30-89 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	0	0
Asset-backed securities \| Greater Than 90 Days
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Repurchase agreements	$ 0	$ 0

US BANCORP \DE\ 10-Q