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Netting Arrangements for Certain Financial Instruments - 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
Dec. 31, 2014
Dec. 31, 2013
Offsetting [Abstract]    
Derivative assets Gross Recognized Assets $ 1,847us-gaap_DerivativeFairValueOfDerivativeAsset $ 1,349us-gaap_DerivativeFairValueOfDerivativeAsset
Reverse repurchase agreements Gross Recognized Assets 40us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross 87us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Securities borrowed Gross Recognized Assets 638us-gaap_SecuritiesBorrowedGross 723us-gaap_SecuritiesBorrowedGross
Total Gross Recognized Assets 2,525us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross 2,159us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
Derivative assets Gross amounts assets offset in consolidated balance sheet (870)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset (599)us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset
Total Gross amounts assets offset in consolidated balance sheet (870)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability (599)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedLiability
Derivative assets Net Amounts Presented in the Consolidated Balance Sheet 977usb_DerivativeAssetsSubjectToMasterNettingArrangement 750usb_DerivativeAssetsSubjectToMasterNettingArrangement
Reverse repurchase agreements Net Amounts Presented in the Consolidated Balance Sheet 40us-gaap_SecuritiesPurchasedUnderAgreementsToResell 87us-gaap_SecuritiesPurchasedUnderAgreementsToResell
Securities borrowed Net Amounts Presented in the Consolidated Balance Sheet 638us-gaap_SecuritiesBorrowed 723us-gaap_SecuritiesBorrowed
Total Net Amounts Presented in the Consolidated Balance Sheet 1,655usb_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedSubjectToMasterNettingArrangement 1,560usb_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedSubjectToMasterNettingArrangement
Derivative assets Gross Amounts Not Offset Consolidated Balance Financial Instruments (58)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction (21)us-gaap_DerivativeAssetNotOffsetPolicyElectionDeduction
Reverse repurchase agreements Gross financial instrument asset amounts not offset in consolidated balance sheet (40)us-gaap_SecuritiesPurchasedUnderAgreementsToResellNotOffsetPolicyElectionDeduction (59)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 (98)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction (80)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotOffsetPolicyElectionDeduction
Reverse repurchase agreements Gross collateral received amounts not offset in consolidated balance sheet   (28)us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities
Securities borrowed Gross collateral received amounts not offset in consolidated balance sheet (620)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities (698)us-gaap_SecuritiesBorrowedCollateralObligationToReturnSecurities
Total Gross collateral received amounts not offset in consolidated balance sheet (620)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities (726)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnSecurities
Derivative assets Net Amount 919us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 729us-gaap_DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Reverse repurchase agreements Net Amount 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 0us-gaap_SecuritiesPurchasedUnderAgreementsToResellOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Securities borrowed Net Amount 18us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 25us-gaap_SecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Total Net Amount Assets 937us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 754us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Derivative liabilities Gross recognized liabilities 1,847us-gaap_DerivativeFairValueOfDerivativeLiability 1,598us-gaap_DerivativeFairValueOfDerivativeLiability
Repurchase agreements Gross recognized liabilities 948us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross 2,059us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross
Securities loaned Gross recognized liabilities 47us-gaap_SecuritiesLoanedGross  
Total Gross recognized liabilities 2,842us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross 3,657us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
Derivative liabilities Gross amounts liabilities offset in consolidated balance sheet (1,317)us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset (1,192)us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset
Total Gross amounts liabilities offset in consolidated balance sheet (1,317)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset (1,192)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAsset
Derivative liabilities Net amounts liabilities presented in consolidated balance sheet 530usb_DerivativeLiabilitiesSubjectToMasterNettingArrangement 406usb_DerivativeLiabilitiesSubjectToMasterNettingArrangement
Repurchase agreements Net amounts liabilities presented in consolidated balance sheet 948us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 2,059us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Securities loaned Net amounts liabilities presented in consolidated balance sheet 47us-gaap_SecuritiesLoaned  
Total Net amounts liabilities presented in consolidated balance sheet 1,525usb_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedSubjectToMasterNettingArrangement 2,465usb_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedSubjectToMasterNettingArrangement
Derivative liabilities Gross financial instrument liability amounts not offset in consolidated balance sheet (58)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction (21)us-gaap_DerivativeLiabilityNotOffsetPolicyElectionDeduction
Repurchase agreements Gross financial instrument liability amounts not offset in consolidated balance sheet (40)us-gaap_SecuritiesSoldUnderAgreementsToResellNotOffsetPolicyElectionDeduction (59)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 (98)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction (80)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotOffsetPolicyElectionDeduction
Repurchase agreements Gross collateral pledged amounts not offset in consolidated balance sheet (908)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities (2,000)us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Securities loaned Gross collateral pledged amounts not offset in consolidated balance sheet (46)us-gaap_SecuritiesLoanedCollateralRightToReclaimSecurities  
Total Gross collateral pledged amounts not offset in consolidated balance sheet (954)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities (2,000)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimSecurities
Derivative liabilities Net Amount 472us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 385us-gaap_DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Repurchase agreements Net Amount 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection 0us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection
Securities loaned net amount 1us-gaap_SecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection  
Total Net Amount Liabilities $ 473us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection $ 385us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection