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GM Financial Receivables, Net Summary of Finance Receivables, Net (Details) - GM Financial [Member] - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Finance Receivables [Line Items]            
Finance Receivables $ 35,646   $ 33,229      
Less: Allowance for Loan Losses (758) $ (760) (695) $ (645) $ (615) $ (548)
GM Financial Receivables, Net 34,888   32,534      
Fair value of GM Financial receivables, net 35,039   33,106      
Allowance for loans losses classified as current (573)   (529)      
Consumer Finance Receivables [Member]            
Finance Receivables [Line Items]            
Finance Receivables 27,987   25,623      
Less: Allowance for Loan Losses (718)   (655)      
GM Financial Receivables, Net 27,269   24,968      
Commercial Finance Receivables [Member]            
Finance Receivables [Line Items]            
Finance Receivables 7,659   7,606      
Less: Allowance for Loan Losses (40)   (40)      
GM Financial Receivables, Net $ 7,619   $ 7,566