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Revenue - Revenue by Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 42,869 $ 44,060 $ 82,730 $ 83,273
Leased vehicle income 1,940 1,803 3,842 3,603
Finance charge income 2,048 1,868 4,069 3,646
Other income 265 237 500 462
GM Financial net sales and revenue 4,253 3,908 8,412 7,710
Net sales and revenue 47,122 47,969 91,141 90,983
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,998 42,515 79,267 80,177
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 524 338 848 571
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,348 1,208 2,615 2,524
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 25 1 51
Net sales and revenue 0 25 1 51
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,940 1,803 3,842 3,603
Finance charge income 2,048 1,876 4,073 3,662
Other income 267 239 504 465
GM Financial net sales and revenue 4,255 3,918 8,419 7,730
Net sales and revenue 4,255 3,918 8,419 7,730
Operating Segments | Services and other | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 25 1 51
Eliminations/Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 (25) 0 (50)
Leased vehicle income 0 0 0 0
Finance charge income 0 (8) (4) (16)
Other income (2) (2) (4) (3)
GM Financial net sales and revenue (2) (10) (7) (19)
Net sales and revenue (2) (35) (7) (69)
Eliminations/Reclassifications | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
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 (50)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,869 44,060 82,730 83,273
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 42,869 44,060 82,729 83,272
Net sales and revenue 42,869 44,060 82,729 83,272
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 39,486 40,725 76,873 76,824
Net sales and revenue 39,486 40,725 76,873 76,824
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,326 3,298 5,753 6,380
Net sales and revenue 3,326 3,298 5,753 6,380
Automotive | Operating Segments | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 40,998 42,515 79,267 80,177
Automotive | Operating Segments | Vehicle, parts and accessories | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 37,893 39,416 74,019 74,313
Automotive | Operating Segments | Vehicle, parts and accessories | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,075 3,091 5,200 5,851
Automotive | Operating Segments | Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 524 338 848 571
Automotive | Operating Segments | Used vehicles | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 515 331 831 559
Automotive | Operating Segments | Used vehicles | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 9 7 17 12
Automotive | Operating Segments | Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,348 1,208 2,614 2,523
Automotive | Operating Segments | Services and other | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,078 979 2,023 1,951
Automotive | Operating Segments | Services and other | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 243 200 536 516
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 57 37 103 68
Net sales and revenue 57 37 103 68
Automotive | Corporate | Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30 8 48 13
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 27 29 55 56
Automotive | Eliminations/Reclassifications        
Disaggregation of Revenue [Line Items]        
Net sales and revenue $ 0 $ 0 $ 0 $ 0