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Revenue - Major Source (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | $ 29,150 | $ 31,261
Leased vehicle income | 2,463 | 2,509
Finance charge income | 1,005 | 985
Other income | 91 | 123
GM Financial net sales and revenue | 3,559 | 3,617
Net sales and revenue | 32,709 | 34,878
Operating Segments [Member] | Cruise [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 25 | 25
Net sales and revenue | 25 | 25
Operating Segments [Member] | GM Financial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Leased vehicle income | 2,463 | 2,509
Finance charge income | 1,006 | 987
Other income | 92 | 124
GM Financial net sales and revenue | 3,561 | 3,620
Net sales and revenue | 3,561 | 3,620
Eliminations/ Reclassifications [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | (24) | (25)
Leased vehicle income | 0 | 0
Finance charge income | (1) | (2)
Other income | (1) | (1)
GM Financial net sales and revenue | (2) | (3)
Net sales and revenue | (26) | (28)
Automotive [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 29,150 | 31,261
Automotive [Member] | Operating Segments [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 29,149 | 31,261
Net sales and revenue | 29,149 | 31,261
Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 25,831 | 27,365
Net sales and revenue | 25,831 | 27,365
Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 3,280 | 3,850
Net sales and revenue | 3,280 | 3,850
Automotive [Member] | Corporate [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 38 | 46
Net sales and revenue | 38 | 46
Vehicles and Parts [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 27,574 | 29,529
Vehicles and Parts [Member] | Eliminations/ Reclassifications [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 27,574 | 29,529
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 24,576 | 25,962
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 2,998 | 3,567
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Used Vehicles [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 403 | 662
Used Vehicles [Member] | Eliminations/ Reclassifications [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 0 | 0
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 403 | 662
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 376 | 627
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 25 | 35
Used Vehicles [Member] | Automotive [Member] | Corporate [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 2 | 0
Services and Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 1,173 | 1,070
Services and Other [Member] | Operating Segments [Member] | Cruise [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 25 | 25
Services and Other [Member] | Eliminations/ Reclassifications [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | (24) | (25)
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 1,172 | 1,070
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 879 | 776
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | 257 | 248
Services and Other [Member] | Automotive [Member] | Corporate [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Automotive net sales and revenue | $ 36 | $ 46

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