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Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Total productive material, supplies and work in process | $ 5,107 | $ 5,008
Finished product, including service parts | 6,182 | 6,032
Total inventories | 11,289 | 11,040
GMNA [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 3,534 | 3,277
Finished product, including service parts | 3,948 | 4,119
Total inventories | 7,482 | 7,396
GMIO [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 873 | 970
Finished product, including service parts | 1,434 | 1,208
Total inventories | 2,307 | 2,178
GMSA [Member] |  |
Inventory [Line Items] |  |
Total productive material, supplies and work in process | 700 | 761
Finished product, including service parts | 800 | 705
Total inventories | $ 1,500 | $ 1,466

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