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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Total productive material, supplies and work in process $ 6,309 $ 5,147
Finished product, including service parts 9,118 8,617
Total inventories 15,427 13,764
GMNA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 3,648 2,705
Finished product, including service parts 4,497 4,884
Total inventories 8,145 7,589
GME [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 720 713
Finished product, including service parts 2,470 2,166
Total inventories 3,190 2,879
GMIO [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 1,100 1,113
Finished product, including service parts 1,322 954
Total inventories 2,422 2,067
GMSA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 841 616
Finished product, including service parts 829 613
Total inventories $ 1,670 $ 1,229