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Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales and revenue (Note 3) | $ 35,791 | $ 33,623 | $ 108,650 | $ 107,873
Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,501 |  | 7,445 |
Finance charge income | 917 |  | 2,667 |
Other income | 100 |  | 305 |
Total net sales and revenue (Note 3) | 3,518 | 3,161 | 10,417 | 8,899
Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (12) |  | (70) |
Leased vehicle income | 0 |  | 0 |
Finance charge income | (2) |  | (5) |
Other income | (1) |  | (4) |
Total net sales and revenue (Note 3) | (15) | (13) | (79) | (152)
Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,276 | 30,466 | 98,242 | 98,983
Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,288 |  | 98,312 |
Total net sales and revenue (Note 3) | 32,288 | 30,475 | 98,312 | 99,126
Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 27,650 |  | 83,969 |
Total net sales and revenue (Note 3) | 27,650 | 24,819 | 83,969 | 82,594
Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 4,582 |  | 14,188 |
Total net sales and revenue (Note 3) | 4,582 | 5,576 | 14,188 | 16,226
Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 56 |  | 155 |
Total net sales and revenue (Note 3) | 56 | 80 | 155 | 306
GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,501 |  | 7,445 |
Finance charge income | 915 |  | 2,662 |
Other income | 99 |  | 301 |
Total net sales and revenue (Note 3) | 3,515 | $ 3,157 | 10,408 | $ 8,890
GM Financial [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales and revenue (Note 3) | (3) |  | (9) |
Vehicles and Parts [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (11) |  | (36) |
Vehicles and Parts [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,490 |  | 92,325 |
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,501 |  | 92,361 |
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 26,273 |  | 79,029 |
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 4,226 |  | 13,320 |
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2 |  | 12 |
Used Vehicles [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (1) |  | (34) |
Used Vehicles [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 604 |  | 2,610 |
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 605 |  | 2,644 |
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 582 |  | 2,506 |
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 23 |  | 138 |
Used Vehicles [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 |  | 0 |
Services and Other [Member] | Eliminations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 |  | 0 |
Services and Other [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,182 |  | 3,307 |
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,182 |  | 3,307 |
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 795 |  | 2,434 |
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 333 |  | 730 |
Services and Other [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 54 |  | $ 143 |

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