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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