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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 40,498 $ 38,703 $ 118,398 $ 104,141
Leased vehicle income 1,820 1,912 5,458 5,967
Finance charge income 1,616 1,157 4,469 3,229
Other income 197 117 538 290
GM Financial net sales and revenue 3,633 3,185 10,465 9,486
Net sales and revenue 44,131 41,889 128,863 113,627
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 25 76 76
Net sales and revenue 25 25 76 76
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,820 1,912 5,458 5,967
Finance charge income 1,621 1,158 4,480 3,230
Other income 200 118 544 293
GM Financial net sales and revenue 3,641 3,187 10,482 9,489
Net sales and revenue 3,641 3,187 10,482 9,489
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (30) (25) (81) (75)
Leased vehicle income 0   0 0
Finance charge income (5)   (11) 0
Other income (3) (1) (6) (3)
GM Financial net sales and revenue (8) (2) (17) (3)
Net sales and revenue (38) (27) (98) (79)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,498 38,703 118,398 104,141
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,503 38,703 118,403 104,140
Net sales and revenue 40,503 38,703 118,403 104,140
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 36,106 34,691 106,214 92,907
Net sales and revenue 36,106 34,691 106,214 92,907
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 4,330 3,980 12,011 11,100
Net sales and revenue 4,330 3,980 12,011 11,100
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 67 32 177 132
Net sales and revenue 67 32 177 132
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 38,818 37,363 113,805 100,267
Vehicle, parts and accessories | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (5) 0 (6) 0
Vehicle, parts and accessories | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 38,823 37,363 113,811 100,267
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 34,893 33,749 102,868 90,147
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,913 3,613 10,876 10,092
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 17 1 67 28
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 322 155 763 378
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 322 155 763 378
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 310 143 741 355
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 12 12 22 23
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 1,359 1,185 3,829 3,495
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 25 76 76
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (25) (75) (75)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,358 1,185 3,828 3,494
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 903 799 2,605 2,405
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 405 355 1,113 985
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 50 $ 31 $ 110 $ 104