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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