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Revenue - Major Source (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 38,703 $ 23,426 $ 104,141 $ 83,237
Leased vehicle income 1,912 2,246 5,967 6,871
Finance charge income 1,157 1,035 3,229 3,087
Other income 117 72 290 225
GM Financial net sales and revenue 3,185 3,353 9,486 10,183
Net sales and revenue 41,889 26,779 113,627 93,420
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 26 76 81
Net sales and revenue 25 26 76 81
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 1,912 2,246 5,967 6,871
Finance charge income 1,158 1,035 3,230 3,087
Other income 118 73 293 229
GM Financial net sales and revenue 3,187 3,354 9,489 10,187
Net sales and revenue 3,187 3,354 9,489 10,187
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (24) (75) (75)
Leased vehicle income 0 0 0 0
Finance charge income 0 0 0 0
Other income (1) (1) (3) (4)
GM Financial net sales and revenue (2) (1) (3) (4)
Net sales and revenue (27) (25) (79) (79)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 38,703 23,426 104,141 83,237
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 38,703 23,424 104,140 83,231
Net sales and revenue 38,703 23,424 104,140 83,231
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 34,691 20,554 92,907 74,443
Net sales and revenue 34,691 20,554 92,907 74,443
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,980 2,843 11,100 8,721
Net sales and revenue 3,980 2,843 11,100 8,721
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32 27 132 67
Net sales and revenue 32 27 132 67
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 37,363 22,187 100,267 79,379
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 37,363 22,187 100,267 79,379
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 33,749 19,633 90,147 71,546
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,613 2,548 10,092 7,825
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1 6 28 8
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 155 129 378 520
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 155 129 378 520
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 143 115 355 480
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 12 14 23 40
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 1,185 1,110 3,495 3,338
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25 26 76 81
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (24) (75) (75)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,185 1,108 3,494 3,332
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 799 806 2,405 2,417
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 355 281 985 856
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 31 $ 21 $ 104 $ 59