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Finance Receivables And Loans, Net (Financing Receivable Credit Quality Indicators) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net $ 99,857us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 99,948us-gaap_LoansAndLeasesReceivableGrossCarryingAmount  
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election 99,856ally_LoansandLeasesReceivableGrossExcludingFairValueOptionElection 99,947ally_LoansandLeasesReceivableGrossExcludingFairValueOptionElection 99,623ally_LoansandLeasesReceivableGrossExcludingFairValueOptionElection
Consumer Loans Auto Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net 57,447us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		 56,570us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		  
Consumer Loans Auto Financing Receivable [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net 57,070us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		 56,184us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		  
Consumer Loans Auto Financing Receivable [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net 377us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		 386us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember		  
Residential Mortgage [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net 7,653us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 7,474us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		  
Loans and Leases Receivable, Gross, Excluding Fair Value Option Election 7,652ally_LoansandLeasesReceivableGrossExcludingFairValueOptionElection
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 7,473ally_LoansandLeasesReceivableGrossExcludingFairValueOptionElection
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		  
Residential Mortgage [Member] | Performing Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net 7,501us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 7,296us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		  
Residential Mortgage [Member] | Nonperforming Financing Receivable [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Finance receivables and loans, net $ 151us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember		 $ 177us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
/ us-gaap_ProductOrServiceAxis
= us-gaap_ResidentialMortgageMember