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Inventories (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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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

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