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Revenue - Major Source (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 23,426 $ 32,067 $ 83,237 $ 74,580
Leased vehicle income 2,246 2,354 6,871 7,203
Finance charge income 1,035 999 3,087 2,970
Other income 72 60 225 214
GM Financial net sales and revenue 3,353 3,413 10,183 10,387
Net sales and revenue 26,779 35,480 93,420 84,967
Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 26 81 79
Net sales and revenue 26 26 81 79
Operating Segments | GM Financial        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,246 2,354 6,871 7,203
Finance charge income 1,035 999 3,087 2,971
Other income 73 68 229 231
GM Financial net sales and revenue 3,354 3,421 10,187 10,405
Net sales and revenue 3,354 3,421 10,187 10,405
Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (24) (25) (75) (75)
Leased vehicle income 0 0 0 0
Finance charge income 0 0 0 (1)
Other income (1) (8) (4) (17)
GM Financial net sales and revenue (1) (8) (4) (18)
Net sales and revenue (25) (33) (79) (93)
Automotive        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 23,426 32,067 83,237 74,580
Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 23,424 32,066 83,231 74,576
Net sales and revenue 23,424 32,066 83,231 74,576
Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 20,554 29,128 74,443 66,563
Net sales and revenue 20,554 29,128 74,443 66,563
Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2,843 2,735 8,721 7,692
Net sales and revenue 2,843 2,735 8,721 7,692
Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 27 203 67 321
Net sales and revenue 27 203 67 321
Vehicle, parts and accessories        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 22,187 30,656 79,379 70,519
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 22,187 30,656 79,379 70,519
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 19,633 28,143 71,546 63,569
Vehicle, parts and accessories | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2,548 2,513 7,825 6,950
Vehicle, parts and accessories | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 6 0 8 0
Used vehicles        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 129 214 520 764
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 129 214 520 764
Used vehicles | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 115 185 480 683
Used vehicles | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 14 23 40 65
Used vehicles | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 6 0 16
Services and other        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,110 1,197 3,338 3,297
Services and other | Operating Segments | Cruise        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26 26 81 79
Services and other | Eliminations/ Reclassifications        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (24) (25) (75) (75)
Services and other | Automotive | Operating Segments        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,108 1,196 3,332 3,293
Services and other | Automotive | Operating Segments | GMNA        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 806 800 2,417 2,311
Services and other | Automotive | Operating Segments | GMI        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 281 199 856 677
Services and other | Automotive | Corporate        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 21 $ 197 $ 59 $ 305