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GM Financial Receivables Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees $ 40,421 $ 31,986    
Finance receivables, individually evaluated for impairment, net of fees 2,250 1,947    
GM Financial receivables 42,671 33,933    
Less: allowance for loan losses (942) (805) $ (749) $ (668)
GM Financial receivables, net 41,729 33,128    
Fair value of GM Financial receivables 41,735 33,181    
Commercial Finance Receivables [Member]        
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees 9,935 7,506    
Finance receivables, individually evaluated for impairment, net of fees 22 27    
GM Financial receivables 9,957 7,533    
Less: allowance for loan losses (53) (40)    
GM Financial receivables, net 9,904 7,493    
Retail Finance Receivables [Member]        
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees 30,486 24,480    
Finance receivables, individually evaluated for impairment, net of fees 2,228 1,920    
GM Financial receivables 32,714 26,400    
Less: allowance for loan losses (889) (765)    
GM Financial receivables, net $ 31,825 $ 25,635