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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 32,614 $ 30,744 $ 65,437 $ 59,811
Leased vehicle income 1,989 2,304 4,056 4,625
Finance charge income 1,062 1,036 2,072 2,052
Other income 94 83 173 153
GM Financial net sales and revenue 3,145 3,423 6,301 6,830
Net sales and revenue 35,759 34,167 71,738 66,641
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 25 51 55
Net sales and revenue 25 25 51 55
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,989 2,304 4,056 4,625
Finance charge income 1,062 1,036 2,072 2,052
Other income 95 86 175 156
GM Financial net sales and revenue 3,146 3,426 6,302 6,833
Net sales and revenue 3,146 3,426 6,302 6,833
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (26) (50) (51)
Leased vehicle income 0 0 0 0
Finance charge income 0 0 0 0
Other income (1) (3) (2) (3)
GM Financial net sales and revenue (1) (3) (2) (3)
Net sales and revenue (26) (29) (52) (54)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,614 30,744 65,437 59,811
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,614 30,745 65,437 59,807
Net sales and revenue 32,614 30,745 65,437 59,807
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 28,760 27,932 58,216 53,889
Net sales and revenue 28,760 27,932 58,216 53,889
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,807 2,792 7,120 5,878
Net sales and revenue 3,807 2,792 7,120 5,878
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 47 21 100 40
Net sales and revenue 47 21 100 40
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 31,314 29,470 62,904 57,191
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 31,314 29,470 62,904 57,191
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 27,826 26,993 56,398 51,913
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,466 2,475 6,479 5,276
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 22 2 27 2
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 143 150 223 391
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 143 150 223 391
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 137 137 212 365
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 6 13 11 26
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 1,158 1,124 2,310 2,229
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 25 51 55
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (26) (50) (51)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,158 1,125 2,309 2,225
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 797 802 1,606 1,611
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 336 304 630 576
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 25 $ 19 $ 73 $ 38