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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 44,060 $ 41,254 $ 83,273 $ 77,900
Leased vehicle income 1,803 1,820 3,603 3,638
Finance charge income 1,868 1,486 3,646 2,852
Other income 237 186 462 341
GM Financial net sales and revenue 3,908 3,493 7,710 6,832
Net sales and revenue 47,969 44,746 90,983 84,732
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 26 51 51
Net sales and revenue 25 26 51 51
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,803 1,820 3,603 3,638
Finance charge income 1,876 1,490 3,662 2,859
Other income 239 187 465 344
GM Financial net sales and revenue 3,918 3,498 7,730 6,841
Net sales and revenue 3,918 3,498 7,730 6,841
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (26) (50) (51)
Leased vehicle income 0 0 0 0
Finance charge income (8) (4) (16) (6)
Other income (2) (1) (3) (3)
GM Financial net sales and revenue (10) (5) (19) (9)
Net sales and revenue (35) (31) (69) (60)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,060 41,254 83,273 77,900
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,060 41,254 83,272 77,900
Net sales and revenue 44,060 41,254 83,272 77,900
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,725 37,220 76,824 70,108
Net sales and revenue 40,725 37,220 76,824 70,108
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,298 3,955 6,380 7,682
Net sales and revenue 3,298 3,955 6,380 7,682
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 37 79 68 110
Net sales and revenue 37 79 68 110
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,515 39,761 80,177 74,988
Vehicle, parts and accessories | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Vehicle, parts and accessories | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,515 39,761 80,177 74,988
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 39,416 36,099 74,313 67,975
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,091 3,621 5,851 6,963
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 8 41 13 50
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 338 262 571 442
Used vehicles | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Used vehicles | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 338 262 571 442
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 331 256 559 431
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 7 6 12 11
Used vehicles | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,208 1,231 2,524 2,470
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 26 51 51
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (26) (50) (51)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,208 1,231 2,523 2,470
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 979 865 1,951 1,702
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 200 328 516 708
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 29 $ 39 $ 56 $ 60