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Finance Receivables - Finance Receivables, net (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables, net $ 32,470,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount $ 33,000,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount    
North America Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables, net 16,929,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
15,943,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
International Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Finance receivables, net 15,541,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
17,057,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Consumer Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 24,297,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
24,389,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Individually evaluated for impairment, net of fees 1,294,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
1,234,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Total finance receivables 25,591,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
25,623,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Less: allowance for loan losses - collective (528,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
(483,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Less: allowance for loan losses - specific (164,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
(172,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Total finance receivables, net 24,899,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
24,968,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
   
Consumer Finance Receivables [Member] | North America Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 13,000,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
12,127,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Individually evaluated for impairment, net of fees 1,294,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
1,234,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Total finance receivables 14,294,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
13,361,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Less: allowance for loan losses - collective (441,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
(405,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Less: allowance for loan losses - specific (164,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
(172,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Total finance receivables, net 13,689,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
12,784,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Consumer Finance Receivables [Member] | North America Segment [Member] | Post-Acquisition Portfolio [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Deferred Income 191,000,000us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= acf_PostAcquisitionPortfolioMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
245,000,000us-gaap_LoansAndLeasesReceivableDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= acf_PostAcquisitionPortfolioMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Consumer Finance Receivables [Member] | International Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 11,297,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
12,262,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Individually evaluated for impairment, net of fees 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Total finance receivables 11,297,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
12,262,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Less: allowance for loan losses - collective (87,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
(78,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Less: allowance for loan losses - specific 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Total finance receivables, net 11,210,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
12,184,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Loans and Leases Receivable, Gross, Consumer, Lease Financing 1,000,000,000us-gaap_LoansAndLeasesReceivableConsumerLeaseFinancing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
1,000,000,000us-gaap_LoansAndLeasesReceivableConsumerLeaseFinancing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoansAutoFinancingReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Commercial Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 7,538,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
7,983,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Individually evaluated for impairment, net of fees 69,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
89,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Total finance receivables 7,607,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
8,072,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
7,108,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
6,700,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Less: allowance for loan losses - collective (31,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(35,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Less: allowance for loan losses - specific (5,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(5,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Total finance receivables, net 7,571,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
8,032,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial Finance Receivables [Member] | North America Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 3,260,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
3,180,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Individually evaluated for impairment, net of fees 0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
0us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Total finance receivables 3,260,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
3,180,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
2,190,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
1,975,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
Less: allowance for loan losses - collective (20,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
(21,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Less: allowance for loan losses - specific 0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
0us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Total finance receivables, net 3,240,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
3,159,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
   
Commercial Finance Receivables [Member] | International Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Collectively evaluated for impairment, net of fees 4,278,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
4,803,000,000us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Individually evaluated for impairment, net of fees 69,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
89,000,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Total finance receivables 4,347,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
4,892,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
4,918,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
4,725,000,000us-gaap_NotesReceivableGross
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
Less: allowance for loan losses - collective (11,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
(14,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Less: allowance for loan losses - specific (5,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
(5,000,000)us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
   
Total finance receivables, net $ 4,331,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
$ 4,873,000,000us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember