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Segment Reporting - Operations Reporting by Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Finance receivables, net $ 32,470us-gaap_LoansAndLeasesReceivableNetReportedAmount $ 33,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
Total assets 49,346us-gaap_Assets 47,724us-gaap_Assets
North America Segment [Member]    
Segment Reporting Information [Line Items]    
Finance receivables, net 16,929us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember		 15,943us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
Total assets 30,535us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember		 27,687us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= acf_NorthAmericaSegmentMember
International Segment [Member]    
Segment Reporting Information [Line Items]    
Finance receivables, net 15,541us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember		 17,057us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember
Total assets $ 18,811us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember		 $ 20,037us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= acf_InternationalSegmentMember