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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
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net $ 99,948us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 100,328us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Commercial Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 35,904us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 35,467us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember
Commercial And Industrial Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 30,871us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember		 30,948us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember
Commercial And Industrial Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 1,882us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 1,664us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember
Commercial Real Estate Automobile [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 3,151us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 2,855us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember
Pass [Member] | Commercial Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance receivables and loans, net 33,674us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 33,352us-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 29,150us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialAutomobileMember		 29,194us-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 1,509us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 1,388us-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 3,015us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 2,770us-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 2,230us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_CommercialLoanMember		 2,115us-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		 1,754us-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 373us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialAndIndustrialOtherMember		 276us-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 $ 136us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember		 $ 85us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= ally_CriticizedMember
/ us-gaap_ProductOrServiceAxis
= ally_CommercialRealEstateAutomobileMember