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Revenue - Disaggregation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue $ 113,590 $ 108,673 $ 122,697
Leased vehicle income 9,026 9,530 10,032
Finance charge income 4,103 3,995 4,064
Other income 285 287 444
GM Financial net sales and revenue 13,414 13,812 14,540
Total net sales and revenue (Note 3) 127,004 122,485 137,237
Operating Segments | Cruise      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 106 103 100
Total net sales and revenue (Note 3) 106 103 100
Operating Segments | GM Financial      
Disaggregation of Revenue [Line Items]      
Leased vehicle income 9,026 9,530 10,032
Finance charge income 4,103 3,996 4,071
Other income 290 305 451
GM Financial net sales and revenue 13,419 13,831 14,554
Total net sales and revenue (Note 3) 13,419 13,831 14,554
Eliminations/ Reclassifications      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue (100) (99) (100)
Leased vehicle income 0 0 0
Finance charge income 0 (1) (7)
Other income (5) (18) (7)
GM Financial net sales and revenue (5) (19) (14)
Total net sales and revenue (Note 3) (105) (118) (114)
Automotive      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 113,590 108,673 122,697
Automotive | Operating Segments      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 113,584 108,669 122,697
Total net sales and revenue (Note 3) 113,584 108,669 122,697
Automotive | Operating Segments | GMNA      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 101,308 96,733 106,366
Total net sales and revenue (Note 3) 101,308 96,733 106,366
Automotive | Operating Segments | GMI      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 12,172 11,586 16,111
Total net sales and revenue (Note 3) 12,172 11,586 16,111
Automotive | Corporate      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 104 350 220
Total net sales and revenue (Note 3) 104 350 220
Vehicle, parts and accessories      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 108,485 103,343 116,277
Vehicle, parts and accessories | Eliminations/ Reclassifications      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 0 0 0
Vehicle, parts and accessories | Automotive | Operating Segments      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 108,485 103,343 116,277
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 97,515 92,749 101,346
Vehicle, parts and accessories | Automotive | Operating Segments | GMI      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 10,956 10,593 14,931
Vehicle, parts and accessories | Automotive | Corporate      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 14 1 0
Used vehicles      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 594 1,010 2,019
Used vehicles | Eliminations/ Reclassifications      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 0 0 0
Used vehicles | Automotive | Operating Segments      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 594 1,010 2,019
Used vehicles | Automotive | Operating Segments | GMNA      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 545 875 1,896
Used vehicles | Automotive | Operating Segments | GMI      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 49 115 123
Used vehicles | Automotive | Corporate      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 0 20 0
Services and other      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 4,511 4,320 4,401
Services and other | Operating Segments | Cruise      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 106 103 100
Services and other | Eliminations/ Reclassifications      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue (100) (99) (100)
Services and other | Automotive | Operating Segments      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 4,505 4,316 4,401
Services and other | Automotive | Operating Segments | GMNA      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 3,248 3,109 3,124
Services and other | Automotive | Operating Segments | GMI      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue 1,167 878 1,057
Services and other | Automotive | Corporate      
Disaggregation of Revenue [Line Items]      
Automotive net sales and revenue $ 90 $ 329 $ 220