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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 41,254 $ 32,614 $ 77,900 $ 65,437
Leased vehicle income 1,820 1,989 3,638 4,056
Finance charge income 1,486 1,062 2,852 2,072
Other income 186 94 341 173
GM Financial net sales and revenue 3,493 3,145 6,832 6,301
Net sales and revenue 44,746 35,759 84,732 71,738
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 25 51 51
Net sales and revenue 26 25 51 51
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,820 1,989 3,638 4,056
Finance charge income 1,490 1,062 2,859 2,072
Other income 187 95 344 175
GM Financial net sales and revenue 3,498 3,146 6,841 6,302
Net sales and revenue 3,498 3,146 6,841 6,302
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (26) (25) (51) (50)
Leased vehicle income 0 0 0 0
Finance charge income (4) 0 (6) 0
Other income (1) (1) (3) (2)
GM Financial net sales and revenue (5) (1) (9) (2)
Net sales and revenue (31) (26) (60) (52)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 41,254 32,614 77,900 65,437
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 41,254 32,614 77,900 65,437
Net sales and revenue 41,254 32,614 77,900 65,437
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 37,220 28,760 70,108 58,216
Net sales and revenue 37,220 28,760 70,108 58,216
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,955 3,807 7,682 7,120
Net sales and revenue 3,955 3,807 7,682 7,120
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 79 47 110 100
Net sales and revenue 79 47 110 100
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 39,761 31,314 74,988 62,904
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 39,761 31,314 74,988 62,904
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 36,099 27,826 67,975 56,398
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,621 3,466 6,963 6,479
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 41 22 50 27
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 262 143 442 223
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 262 143 442 223
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 256 137 431 212
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 6 6 11 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 1,231 1,158 2,470 2,310
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 25 51 51
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (26) (25) (51) (50)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,231 1,158 2,470 2,309
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 865 797 1,702 1,606
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 328 336 708 630
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 39 $ 25 $ 60 $ 73