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Revenue - Revenue by Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 44,256 $ 44,735 $ 126,986 $ 128,008
Leased vehicle income 1,968 1,828 5,810 5,431
Finance charge income 2,060 1,956 6,129 5,602
Other income 308 237 808 698
GM Financial net sales and revenue 4,335 4,021 12,747 11,732
Net sales and revenue 48,591 48,757 139,732 139,740
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,159 43,097 121,424 123,275
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 461 377 1,309 948
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,637 1,260 4,253 3,784
Operating Segments        
Disaggregation of Revenue [Line Items]        
Net sales and revenue 48,533 48,731 139,579 139,715
Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Net sales and revenue 40,551 41,157 117,424 117,981
Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Net sales and revenue 3,645 3,517 9,398 9,897
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue   26 1 76
Net sales and revenue 0 26 1 76
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,968 1,828 5,810 5,431
Finance charge income 2,060 1,965 6,132 5,627
Other income 309 238 813 703
GM Financial net sales and revenue 4,337 4,031 12,756 11,761
Net sales and revenue 4,337 4,031 12,756 11,761
Operating Segments | Services and other | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue   26 1 76
Corporate        
Disaggregation of Revenue [Line Items]        
Net sales and revenue 60 62 163 130
Eliminations/Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 (26) 0 (76)
Leased vehicle income 0 0 0 0
Finance charge income 0 (8) (4) (25)
Other income (2) (2) (5) (5)
GM Financial net sales and revenue (2) (10) (9) (29)
Net sales and revenue (2) (36) (9) (105)
Eliminations/Reclassifications | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 (1) 0 (1)
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 0 (25) 0 (75)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,256 44,735 126,986 128,008
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 44,256 44,735 126,985 128,007
Net sales and revenue 44,256 44,735 126,985 128,007
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,551 41,157 117,424 117,981
Net sales and revenue 40,551 41,157 117,424 117,981
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,645 3,517 9,398 9,897
Net sales and revenue 3,645 3,517 9,398 9,897
Automotive | Operating Segments | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,159 43,098 121,424 123,276
Automotive | Operating Segments | Vehicle, parts and accessories | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 38,752 39,817 112,770 114,131
Automotive | Operating Segments | Vehicle, parts and accessories | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,355 3,244 8,554 9,095
Automotive | Operating Segments | Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 461 377 1,309 948
Automotive | Operating Segments | Used vehicles | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 453 368 1,284 927
Automotive | Operating Segments | Used vehicles | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 8 9 25 21
Automotive | Operating Segments | Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,637 1,259 4,252 3,783
Automotive | Operating Segments | Services and other | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,347 971 3,370 2,923
Automotive | Operating Segments | Services and other | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 282 264 819 780
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 60 62 163 130
Net sales and revenue 60 62 163 130
Automotive | Corporate | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 52 37 100 50
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 $ 8 $ 24 $ 63 $ 80