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Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Total productive material, supplies and work in process | $ 6,014 | $ 5,643
Finished product, including service parts | 8,672 | 8,145
Total inventories | 14,686 | 13,788
GMNA [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 3,525 | 3,226
Finished product, including service parts | 4,073 | 4,108
Total inventories | 7,598 | 7,334
GME [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 704 | 684
Finished product, including service parts | 2,625 | 2,229
Total inventories | 3,329 | 2,913
GMIO [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 999 | 974
Finished product, including service parts | 1,231 | 1,107
Total inventories | 2,230 | 2,081
GMSA [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 786 | 759
Finished product, including service parts | 743 | 701
Total inventories | $ 1,529 | $ 1,460

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