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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory [Line Items]    
Total productive material, supplies and work in process $ 5,643 $ 5,147
Finished product, including service parts 8,145 8,617
Total inventories 13,788 13,764
GMNA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 3,226 2,705
Finished product, including service parts 4,108 4,884
Total inventories 7,334 7,589
GME [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 684 713
Finished product, including service parts 2,229 2,166
Total inventories 2,913 2,879
GMIO [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 974 1,113
Finished product, including service parts 1,107 954
Total inventories 2,081 2,067
GMSA [Member]    
Inventory [Line Items]    
Total productive material, supplies and work in process 759 616
Finished product, including service parts 701 613
Total inventories $ 1,460 $ 1,229