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Netting Arrangements for Certain Financial Instruments and Securities Financing Activities - Information on Company's Accounting Netting Adjustments and Items Not Offset in Consolidated Balance Sheet But Available for Offset in Event of Default (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Offsetting [Abstract]    
Derivative assets Gross Recognized Assets $ 2,469us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,847us-gaap_DerivativeFairValueOfDerivativeAsset
Reverse repurchase agreements Gross Recognized Assets 136us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross 40us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Securities borrowed Gross Recognized Assets 666us-gaap_SecuritiesBorrowedGross 638us-gaap_SecuritiesBorrowedGross
Total Gross Recognized Assets 3,271us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross 2,525us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Derivative assets Gross amounts assets offset in consolidated balance sheet (1,209)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset (870)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset
Total Gross amounts assets offset in consolidated balance sheet (1,209)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability (870)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Derivative assets Net Amounts Presented in the Consolidated Balance Sheet 1,260usb_DerivativeAssetsSubjectToMasterNettingArrangement 977usb_DerivativeAssetsSubjectToMasterNettingArrangement
Reverse repurchase agreements Net Amounts Presented in the Consolidated Balance Sheet 136us-gaap_SecuritiesPurchasedUnderAgreementsToResell 40us-gaap_SecuritiesPurchasedUnderAgreementsToResell
Securities borrowed Net Amounts Presented in the Consolidated Balance Sheet 666us-gaap_SecuritiesBorrowed 638us-gaap_SecuritiesBorrowed
Total Net Amounts Presented in the Consolidated Balance Sheet 2,062usb_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedSubjectToMasterNettingArrangement 1,655usb_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedSubjectToMasterNettingArrangement
Derivative assets Gross Amounts Not Offset Consolidated Balance Financial Instruments (73)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction (58)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction
Reverse repurchase agreements Gross financial instrument asset amounts not offset in consolidated balance sheet (37)us-gaap_SecuritiesPurchasedUnderAgreementsToResellNotOffsetPolicyElectionDeduction (40)us-gaap_SecuritiesPurchasedUnderAgreementsToResellNotOffsetPolicyElectionDeduction
Securities borrowed Gross financial instrument asset amounts not offset in consolidated balance sheet 0us-gaap_SecuritiesBorrowedNotOffsetPolicyElectionDeduction 0us-gaap_SecuritiesBorrowedNotOffsetPolicyElectionDeduction
Total Gross financial instrument asset amounts not offset in consolidated balance sheet (110)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction (98)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction
Reverse repurchase agreements Gross collateral received amounts not offset in consolidated balance sheet (99)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities  
Securities borrowed Gross collateral received amounts not offset in consolidated balance sheet (648)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities (620)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities
Total Gross collateral received amounts not offset in consolidated balance sheet (747)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities (620)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
Derivative assets Net Amount 1,187us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 919us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Reverse repurchase agreements Net Amount 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Securities borrowed Net Amount 18us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 18us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Total Net Amount Assets 1,205us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 937us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Derivative liabilities Gross recognized liabilities 2,436us-gaap_DerivativeFairValueOfDerivativeLiability 1,847us-gaap_DerivativeFairValueOfDerivativeLiability
Repurchase agreements Gross recognized liabilities 965us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross 948us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities loaned Gross recognized liabilities 199us-gaap_SecuritiesLoanedGross 47us-gaap_SecuritiesLoanedGross
Total Gross recognized liabilities 3,600us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross 2,842us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Derivative liabilities Gross amounts liabilities offset in consolidated balance sheet (1,645)us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset (1,317)us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset
Total Gross amounts liabilities offset in consolidated balance sheet (1,645)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset (1,317)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Derivative liabilities Net amounts liabilities presented in consolidated balance sheet 791usb_DerivativeLiabilitiesSubjectToMasterNettingArrangement 530usb_DerivativeLiabilitiesSubjectToMasterNettingArrangement
Repurchase agreements Net amounts liabilities presented in consolidated balance sheet 965us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 948us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities loaned Net amounts liabilities presented in consolidated balance sheet 199us-gaap_SecuritiesLoaned 47us-gaap_SecuritiesLoaned
Total Net amounts liabilities presented in consolidated balance sheet 1,955usb_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedSubjectToMasterNettingArrangement 1,525usb_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedSubjectToMasterNettingArrangement
Derivative liabilities Gross financial instrument liability amounts not offset in consolidated balance sheet (73)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction (58)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction
Repurchase agreements Gross financial instrument liability amounts not offset in consolidated balance sheet (37)us-gaap_SecuritiesSoldUnderAgreementsToResellNotOffsetPolicyElectionDeduction (40)us-gaap_SecuritiesSoldUnderAgreementsToResellNotOffsetPolicyElectionDeduction
Securities loaned Gross financial instruments not offset in consolidated balance sheet 0us-gaap_SecuritiesLoanedNotOffsetPolicyElectionDeduction 0us-gaap_SecuritiesLoanedNotOffsetPolicyElectionDeduction
Total Gross financial instrument liability amounts not offset in consolidated balance sheet (110)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction (98)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction
Repurchase agreements Gross collateral pledged amounts not offset in consolidated balance sheet (928)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities (908)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Securities loaned Gross collateral pledged amounts not offset in consolidated balance sheet (197)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities (46)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities
Total Gross collateral pledged amounts not offset in consolidated balance sheet (1,125)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities (954)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Derivative liabilities Net Amount 718us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 472us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Repurchase agreements Net Amount 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Securities loaned Net amount 2us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 1us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Total Net Amount Liabilities $ 720us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection $ 473us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection