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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
GM Financial [Member]          
Related Party Transaction [Line Items]          
Financing receivable, net $ 54,189   $ 54,189   $ 51,933
GM Financial [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Financing receivable, net 12,479   12,479   12,209
GM Financial [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Financing receivable, net 41,710   41,710   39,724
Intersegment Eliminations [Member]          
Related Party Transaction [Line Items]          
Cash payments to GM Financial 959 $ 1,100 2,000 $ 1,700  
Intersegment Eliminations [Member] | GM Financial [Member]          
Related Party Transaction [Line Items]          
Subvention receivable 705   705   727
Interest subvention earned on finance receivables 147 137 295 267  
Leased vehicle subvention earned 818 $ 813 1,653 $ 1,611  
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Financing receivable, net 491   491   445
Commercial loan funding payable 66   66   61
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]          
Related Party Transaction [Line Items]          
Financing receivable, net $ 108   $ 108   $ 134