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GM Financial Receivables and Transactions Intercompany Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 26, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
GM Financial [Member]            
Related Party Transaction [Line Items]            
Financing receivable, net   $ 47,518   $ 47,518   $ 41,729
GM Financial [Member] | Subsequent Event [Member]            
Related Party Transaction [Line Items]            
Common stock dividends declared $ 375          
GM Financial [Member] | Commercial Finance Receivables [Member]            
Related Party Transaction [Line Items]            
Financing receivable, net   10,607   10,607   9,904
GM Financial [Member] | Retail Finance Receivables [Member]            
Related Party Transaction [Line Items]            
Financing receivable, net   36,911   36,911   31,825
Intersegment Eliminations [Member]            
Related Party Transaction [Line Items]            
Cash payments to GM Financial   1,100 $ 1,100 2,800 $ 3,300  
Intersegment Eliminations [Member] | GM Financial [Member]            
Related Party Transaction [Line Items]            
Subvention receivable   735   735   306
Interest subvention earned on finance receivables   142 129 409 361  
Leased vehicle subvention earned   827 $ 786 2,438 $ 2,246  
Intersegment Eliminations [Member] | GM Financial [Member] | Commercial Finance Receivables [Member]            
Related Party Transaction [Line Items]            
Financing receivable, net   437   437   355
Commercial loan funding payable   86   86   90
Intersegment Eliminations [Member] | GM Financial [Member] | Retail Finance Receivables [Member]            
Related Party Transaction [Line Items]            
Financing receivable, net   $ 125   $ 125   $ 88