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Revenue - Major Source (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales and revenue (Note 2) | $ 36,060 | $ 36,760 | $ 70,938 | $ 72,859
Operating Segments [Member] | GM Cruise [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 25 |  | 50 |
Total net sales and revenue (Note 2) | 25 | 0 | 50 | 0
Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,512 | 2,497 | 5,021 | 4,944
Finance charge income | 1,008 | 884 | 1,995 | 1,750
Other income | 119 | 107 | 243 | 205
Total net sales and revenue (Note 2) | 3,639 | 3,488 | 7,259 | 6,899
Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (25) | (34) | (50) | (58)
Leased vehicle income | 0 | 0 | 0 | 0
Finance charge income | (2) | (1) | (4) | (3)
Other income | (2) | (2) | (3) | (3)
Total net sales and revenue (Note 2) | (29) | (37) | (57) | (64)
Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,425 | 33,275 | 63,686 | 65,966
Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,425 | 33,309 | 63,686 | 66,024
Total net sales and revenue (Note 2) | 32,425 | 33,309 | 63,686 | 66,024
Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 28,324 | 28,501 | 55,689 | 56,319
Total net sales and revenue (Note 2) | 28,324 | 28,501 | 55,689 | 56,319
Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 4,047 | 4,758 | 7,897 | 9,606
Total net sales and revenue (Note 2) | 4,047 | 4,758 | 7,897 | 9,606
Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 54 | 50 | 100 | 99
Total net sales and revenue (Note 2) | 54 | 50 | 100 | 99
GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,512 | 2,497 | 5,021 | 4,944
Finance charge income | 1,006 | 883 | 1,991 | 1,747
Other income | 117 | 105 | 240 | 202
Total net sales and revenue (Note 2) | 3,635 | 3,485 | 7,252 | 6,893
GM Financial [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales and revenue (Note 2) | (4) | (3) | (7) | (6)
Vehicles and Parts [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | (18) | 0 | (25)
Vehicles and Parts [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,720 | 31,346 | 60,249 | 61,835
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,720 | 31,364 | 60,249 | 61,860
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 26,976 | 26,874 | 52,938 | 52,756
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 3,744 | 4,489 | 7,311 | 9,094
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 1 | 0 | 10
Used Vehicles [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | (16) | 0 | (33)
Used Vehicles [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 606 | 821 | 1,268 | 2,006
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 606 | 837 | 1,268 | 2,039
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 577 | 769 | 1,204 | 1,924
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 29 | 68 | 64 | 115
Used Vehicles [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Services and Other [Member] | Operating Segments [Member] | GM Cruise [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 25 |  | 50 |
Services and Other [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (25) | 0 | (50) | 0
Services and Other [Member] | Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,099 | 1,108 | 2,169 | 2,125
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,099 | 1,108 | 2,169 | 2,125
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 771 | 858 | 1,547 | 1,639
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 274 | 201 | 522 | 397
Services and Other [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 54 | $ 49 | $ 100 | $ 89

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