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Fair Values of Assets and Liabilities - Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financial Assets        
Cash and due from banks $ 10,654us-gaap_CashAndDueFromBanks $ 8,477us-gaap_CashAndDueFromBanks $ 8,252us-gaap_CashAndDueFromBanks $ 13,962us-gaap_CashAndDueFromBanks
Investment securities held-to-maturity 44,974us-gaap_HeldToMaturitySecurities [1] 38,920us-gaap_HeldToMaturitySecurities [1]    
Financial Liabilities        
Deposits 282,733us-gaap_Deposits 262,123us-gaap_Deposits    
Long-term debt 32,260us-gaap_LongTermDebt 20,049us-gaap_LongTermDebt    
Carrying Amount [Member]        
Financial Assets        
Cash and due from banks 10,654us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
8,477us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Federal funds sold and securities purchased under resale agreements 118us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
163us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Investment securities held-to-maturity 44,974us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
38,920us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Loans held for sale 18us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
5us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Loans 243,735usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
230,857usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Other financial instruments 2,187usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
2,443usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Financial Liabilities        
Deposits 282,733us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
262,123us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Short-term borrowings 29,184usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
26,945usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Long-term debt 32,260us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
20,049us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Other Liabilities 1,231usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
1,263usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Fair Value [Member]        
Financial Assets        
Cash and due from banks 10,654us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
8,477us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Federal funds sold and securities purchased under resale agreements 118us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
163us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Investment securities held-to-maturity 45,140us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
38,368us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loans held for sale 18us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
5us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loans 245,424usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
231,480usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Other financial instruments 2,193usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
2,463usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial Liabilities        
Deposits 282,708us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
262,200us-gaap_Deposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Short-term borrowings 28,973usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
26,863usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Long-term debt 32,659us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
20,391us-gaap_LongTermDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Other Liabilities 1,231usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,263usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 1 [Member]        
Financial Assets        
Cash and due from banks 10,654us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
8,477us-gaap_CashAndDueFromBanks
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Investment securities held-to-maturity 1,928us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
2,589us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 2 [Member]        
Financial Assets        
Federal funds sold and securities purchased under resale agreements 118us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
163us-gaap_FederalFundsSoldAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Investment securities held-to-maturity 43,124us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
35,678us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Other financial instruments 924usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,080usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial Liabilities        
Deposits 282,708us-gaap_Deposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
262,200us-gaap_Deposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Short-term borrowings 28,973usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
26,863usb_ShortTermBorrowingsExcludingObligationOnSecuritiesSoldShort
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Long-term debt 32,659us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
20,391us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value [Member] | Level 3 [Member]        
Financial Assets        
Investment securities held-to-maturity 88us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
101us-gaap_HeldToMaturitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loans held for sale 18us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
5us-gaap_LoansHeldForSaleOther
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Loans 245,424usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
231,480usb_LoansAndLeasesReceivableNetReportedAmountCoveredAndNotCoveredExcludingLoansMeasuredAtFairValueOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Other financial instruments 1,269usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
1,383usb_OtherFinancialInstrumentsAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial Liabilities        
Other Liabilities $ 1,231usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 1,263usb_OtherCommunityDevelopmentAndTaxAdvantagedLiabilities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.