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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 30,744 $ 13,363 $ 59,811 $ 42,513
Leased vehicle income 2,304 2,386 4,625 4,849
Finance charge income 1,036 966 2,052 1,971
Other income 83 63 153 154
GM Financial net sales and revenue 3,423 3,415 6,830 6,974
Net sales and revenue 34,167 16,778 66,641 49,487
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 28 55 53
Net sales and revenue 25 28 55 53
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,304 2,386 4,625 4,849
Finance charge income 1,036 966 2,052 1,972
Other income 86 71 156 163
GM Financial net sales and revenue 3,426 3,423 6,833 6,984
Net sales and revenue 3,426 3,423 6,833 6,984
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (26) (26) (51) (50)
Leased vehicle income 0 0 0 0
Finance charge income 0 0 0 (1)
Other income (3) (8) (3) (9)
GM Financial net sales and revenue (3) (8) (3) (10)
Net sales and revenue (29) (34) (54) (60)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,744 13,363 59,811 42,513
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,745 13,361 59,807 42,510
Net sales and revenue 30,745 13,361 59,807 42,510
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 27,932 11,604 53,889 37,435
Net sales and revenue 27,932 11,604 53,889 37,435
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2,792 1,677 5,878 4,957
Net sales and revenue 2,792 1,677 5,878 4,957
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 21 80 40 118
Net sales and revenue 21 80 40 118
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 29,470 12,289 57,191 39,863
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 29,470 12,289 57,191 39,863
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26,993 10,850 51,913 35,426
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2,475 1,439 5,276 4,437
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2 0 2 0
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 150 147 391 550
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 150 147 391 550
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 137 122 365 498
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 13 17 26 42
Used vehicles | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 8 0 10
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,124 927 2,229 2,100
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 28 55 53
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (26) (26) (51) (50)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,125 925 2,225 2,097
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 802 632 1,611 1,511
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 304 221 576 478
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 19 $ 72 $ 38 $ 108