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GM Financial Receivables Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees $ 45,305 $ 41,641    
Finance receivables, individually evaluated for impairment, net of fees 2,044 1,991    
GM Financial receivables 47,349 43,632    
Less: allowance for loan losses (906) (843) $ (843) $ (782)
GM Financial receivables, net 46,443 42,789    
Fair value of GM Financial receivables 46,255 42,739    
Retail Finance Receivables [Member]        
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees 33,919 30,989    
Finance receivables, individually evaluated for impairment, net of fees 1,957 1,921    
GM Financial receivables 35,876 32,910    
Less: allowance for loan losses (852) (793)    
GM Financial receivables, net 35,024 32,117    
Commercial Finance Receivables [Member]        
Finance Receivables [Line Items]        
Finance receivables, collectively evaluated for impairment, net of fees 11,386 10,652    
Finance receivables, individually evaluated for impairment, net of fees 87 70    
GM Financial receivables 11,473 10,722    
Less: allowance for loan losses (54) (50)    
GM Financial receivables, net $ 11,419 $ 10,672