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GM Financial Receivables, Net Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables $ 34,969 $ 33,229
Commercial Finance Receivables [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 7,639 7,606
Commercial Finance Receivables [Member] | Group I Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 1,067 1,050
Commercial Finance Receivables [Member] | Group II Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 2,342 2,022
Commercial Finance Receivables [Member] | Group III Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 2,520 2,599
Commercial Finance Receivables [Member] | Group IV Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 1,068 1,173
Commercial Finance Receivables [Member] | Group V Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 442 524
Commercial Finance Receivables [Member] | Group VI Dealers [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables $ 200 $ 238