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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Total productive material, supplies and work in process $ 6,297 $ 5,147
Finished product, including service parts 8,729 8,617
Total inventories 15,026 13,764
GMNA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 3,550 2,705
Finished product, including service parts 4,239 4,884
Total inventories 7,789 7,589
GME [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 680 713
Finished product, including service parts 2,538 2,166
Total inventories 3,218 2,879
GMIO [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 1,180 1,113
Finished product, including service parts 1,213 954
Total inventories 2,393 2,067
GMSA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 887 616
Finished product, including service parts 739 613
Total inventories $ 1,626 $ 1,229