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Revenue - Revenue by Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 44,735 $ 40,498 $ 128,008 $ 118,398
Leased vehicle income 1,828 1,820 5,431 5,458
Finance charge income 1,956 1,616 5,602 4,469
Other income 237 197 698 538
GM Financial net sales and revenue 4,021 3,633 11,732 10,465
Net sales and revenue 48,757 44,131 139,740 128,863
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 43,097 38,818 123,275 113,805
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 377 322 948 763
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,260 1,359 3,784 3,829
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 25 76 76
Net sales and revenue 26 25 76 76
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,828 1,820 5,431 5,458
Finance charge income 1,965 1,621 5,627 4,480
Other income 238 200 703 544
GM Financial net sales and revenue 4,031 3,641 11,761 10,482
Net sales and revenue 4,031 3,641 11,761 10,482
Operating Segments | Services and other | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 25 76 76
Eliminations/Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (26) (30) (76) (81)
Leased vehicle income 0 0 0 0
Finance charge income (8) (5) (25) (11)
Other income (2) (3) (5) (6)
GM Financial net sales and revenue (10) (8) (29) (17)
Net sales and revenue (36) (38) (105) (98)
Eliminations/Reclassifications | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (1) (5) (1) (6)
Eliminations/Reclassifications | Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Eliminations/Reclassifications | Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (25) (75) (75)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,735 40,498 128,008 118,398
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,735 40,503 128,007 118,403
Net sales and revenue 44,735 40,503 128,007 118,403
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 41,157 36,106 117,981 106,214
Net sales and revenue 41,157 36,106 117,981 106,214
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,517 4,330 9,897 12,011
Net sales and revenue 3,517 4,330 9,897 12,011
Automotive | Operating Segments | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 43,098 38,823 123,276 113,811
Automotive | Operating Segments | Vehicle, parts and accessories | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 39,817 34,893 114,131 102,868
Automotive | Operating Segments | Vehicle, parts and accessories | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,244 3,913 9,095 10,876
Automotive | Operating Segments | Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 377 322 948 763
Automotive | Operating Segments | Used vehicles | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 368 310 927 741
Automotive | Operating Segments | Used vehicles | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 9 12 21 22
Automotive | Operating Segments | Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,259 1,358 3,783 3,828
Automotive | Operating Segments | Services and other | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 971 903 2,923 2,605
Automotive | Operating Segments | Services and other | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 264 405 780 1,113
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 62 67 130 177
Net sales and revenue 62 67 130 177
Automotive | Corporate | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 37 17 50 67
Automotive | Corporate | Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Automotive | Corporate | Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 24 $ 50 $ 80 $ 110