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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | $ 33,275 | $ 33,998 | $ 65,966 | $ 68,517
Leased vehicle income | 2,497 |  | 4,944 |
Finance charge income | 883 |  | 1,747 |
Other income | 105 |  | 202 |
GM Financial | 3,485 | 2,986 | 6,893 | 5,733
Total net sales and revenue (Note 3) | 36,760 | 36,984 | 72,859 | 74,250
Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Leased vehicle income | 2,497 |  | 4,944 |
Finance charge income | 884 |  | 1,750 |
Other income | 107 |  | 205 |
GM Financial | 3,488 |  | 6,899 |
Total net sales and revenue (Note 3) | 3,488 | 2,990 | 6,899 | 5,738
Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | (34) |  | (58) |
Leased vehicle income | 0 |  | 0 |
Finance charge income | (1) |  | (3) |
Other income | (2) |  | (3) |
GM Financial | (3) |  | (6) |
Total net sales and revenue (Note 3) | (37) | (7) | (64) | (139)
Group [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 33,309 |  | 66,024 |
Total net sales and revenue (Note 3) | 33,309 | 34,001 | 66,024 | 68,651
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 28,501 |  | 56,319 |
Total net sales and revenue (Note 3) | 28,501 | 28,437 | 56,319 | 57,775
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 4,758 |  | 9,606 |
Total net sales and revenue (Note 3) | 4,758 | 5,512 | 9,606 | 10,650
Group [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 50 |  | 99 |
Total net sales and revenue (Note 3) | 50 | $ 52 | 99 | $ 226
Vehicles and Parts [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 31,346 |  | 61,835 |
Vehicles and Parts [Member] | Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Vehicles and Parts [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | (18) |  | (25) |
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 31,364 |  | 61,860 |
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 26,874 |  | 52,756 |
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 4,489 |  | 9,094 |
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 1 |  | 10 |
Used Vehicles [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 821 |  | 2,006 |
Used Vehicles [Member] | Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Used Vehicles [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | (16) |  | (33) |
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 837 |  | 2,039 |
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 769 |  | 1,924 |
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 68 |  | 115 |
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Services and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 1,108 |  | 2,125 |
Services and Other [Member] | Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Services and Other [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 0 |  | 0 |
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 1,108 |  | 2,125 |
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 858 |  | 1,639 |
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | 201 |  | 397 |
Services and Other [Member] | Group [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive | $ 49 |  | $ 89 |

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