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Finance Receivables And Loans, Net (Schedule Of Pass And Criticized Credit Quality Indicators Of Finance Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net $ 99,857us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 99,948us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 34,757us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 35,904us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
Commercial And Industrial Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 29,544us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember		 30,871us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember
Commercial And Industrial Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 2,004us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 1,882us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember
Commercial Real Estate Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 3,209us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 3,151us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember
Pass [Member] | Commercial Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 32,385us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 33,674us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
Pass [Member] | Commercial And Industrial Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 27,823us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember		 29,150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember
Pass [Member] | Commercial And Industrial Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 1,503us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 1,509us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember
Pass [Member] | Commercial Real Estate Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 3,059us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 3,015us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember
Criticized Member | Commercial Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 2,372us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 2,230us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
Criticized Member | Commercial And Industrial Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 1,721us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember		 1,721us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember
Criticized Member | Commercial And Industrial Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 501us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 373us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember
Criticized Member | Commercial Real Estate Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net $ 150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 $ 136us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember