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Revenue - Major Source (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 32,067 | $ 31,817 | $ 74,580 | $ 95,503
Leased vehicle income | 2,354 | 2,515 | 7,203 | 7,536
Finance charge income | 999 | 1,041 | 2,970 | 3,032
Other income | 60 | 100 | 214 | 340
GM Financial net sales and revenue | 3,413 | 3,656 | 10,387 | 10,908
Net sales and revenue | 35,480 | 35,473 | 84,967 | 106,411
Operating Segments [Member] | Cruise [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 26 | 25 | 79 | 75
Net sales and revenue | 26 | 25 | 79 | 75
Operating Segments [Member] | GM Financial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Leased vehicle income | 2,354 | 2,515 | 7,203 | 7,536
Finance charge income | 999 | 1,043 | 2,971 | 3,038
Other income | 68 | 101 | 231 | 344
GM Financial net sales and revenue | 3,421 | 3,659 | 10,405 | 10,918
Net sales and revenue | 3,421 | 3,659 | 10,405 | 10,918
Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (25) | (25) | (75) | (75)
Leased vehicle income | 0 | 0 | 0 | 0
Finance charge income | 0 | (2) | (1) | (6)
Other income | (8) | (1) | (17) | (4)
GM Financial net sales and revenue | (8) | (3) | (18) | (10)
Net sales and revenue | (33) | (28) | (93) | (85)
Automotive [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,067 | 31,817 | 74,580 | 95,503
Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 32,066 | 31,817 | 74,576 | 95,503
Net sales and revenue | 32,066 | 31,817 | 74,576 | 95,503
Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 29,128 | 27,971 | 66,563 | 83,660
Net sales and revenue | 29,128 | 27,971 | 66,563 | 83,660
Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2,735 | 3,794 | 7,692 | 11,691
Net sales and revenue | 2,735 | 3,794 | 7,692 | 11,691
Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 203 | 52 | 321 | 152
Net sales and revenue | 203 | 52 | 321 | 152
Vehicles and Parts [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,656 | 30,344 | 70,519 | 90,593
Vehicles and Parts [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 30,656 | 30,344 | 70,519 | 90,593
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 28,143 | 26,825 | 63,569 | 79,763
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 2,513 | 3,519 | 6,950 | 10,830
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Used Vehicles [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 214 | 376 | 764 | 1,644
Used Vehicles [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 0 | 0 | 0 | 0
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 214 | 376 | 764 | 1,644
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 185 | 345 | 683 | 1,549
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 23 | 31 | 65 | 95
Used Vehicles [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 6 | 0 | 16 | 0
Services and Other [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,197 | 1,097 | 3,297 | 3,266
Services and Other [Member] | Operating Segments [Member] | Cruise [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 26 | 25 | 79 | 75
Services and Other [Member] | Eliminations/ Reclassifications [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | (25) | (25) | (75) | (75)
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 1,196 | 1,097 | 3,293 | 3,266
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 800 | 801 | 2,311 | 2,348
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | 199 | 244 | 677 | 766
Services and Other [Member] | Automotive [Member] | Corporate [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Automotive net sales and revenue | $ 197 | $ 52 | $ 305 | $ 152

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