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GM Financial Receivables Summary of Finance Receivables (Details) - GM Financial [Member] - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Finance Receivables [Line Items]            
GM Financial receivables $ 41,668   $ 37,333      
Less: Allowance for Loan Losses (874) $ (864) (782) $ (758) $ (760) $ (695)
GM Financial Receivables, net 40,794   36,551      
Fair value of GM Financial receivables 41,192   36,707      
Retail Finance Receivables [Member]            
Finance Receivables [Line Items]            
GM Financial receivables 32,246   29,124      
Less: Allowance for Loan Losses (822)   (735)      
GM Financial Receivables, net 31,424   28,389      
Commercial Finance Receivables [Member]            
Finance Receivables [Line Items]            
GM Financial receivables 9,422   8,209      
Less: Allowance for Loan Losses (52)   (47)      
GM Financial Receivables, net $ 9,370   $ 8,162      
Commercial Finance Receivables [Member] | Level 2 [Member]            
Finance Receivables [Line Items]            
Maximum Maturity Period for Finance Receivables 1 year