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Revenue - Major Source (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue $ 32,824 $ 29,067
Leased vehicle income 2,066 2,321
Finance charge income 1,010 1,016
Other income 79 70
GM Financial net sales and revenue 3,155 3,407
Net sales and revenue 35,979 32,474
Operating Segments | Cruise    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 26 30
Net sales and revenue 26 30
Operating Segments | GM Financial    
Disaggregation of Revenue [Line Items]    
Leased vehicle income 2,066 2,321
Finance charge income 1,010 1,016
Other income 80 70
GM Financial net sales and revenue 3,156 3,407
Net sales and revenue 3,156 3,407
Eliminations/ Reclassifications    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue (25) (25)
Leased vehicle income 0 0
Finance charge income 0 0
Other income (1) 0
GM Financial net sales and revenue (1) 0
Net sales and revenue (26) (25)
Automotive    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 32,824 29,067
Automotive | Operating Segments    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 32,823 29,062
Net sales and revenue 32,823 29,062
Automotive | Operating Segments | GMNA    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 29,456 25,957
Net sales and revenue 29,456 25,957
Automotive | Operating Segments | GMI    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 3,313 3,086
Net sales and revenue 3,313 3,086
Automotive | Corporate    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 53 19
Net sales and revenue 53 19
Vehicle, parts and accessories    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 31,591 27,721
Vehicle, parts and accessories | Eliminations/ Reclassifications    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 0 0
Vehicle, parts and accessories | Automotive | Operating Segments    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 31,591 27,721
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 28,572 24,920
Vehicle, parts and accessories | Automotive | Operating Segments | GMI    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 3,014 2,801
Vehicle, parts and accessories | Automotive | Corporate    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 5 0
Used vehicles    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 80 241
Used vehicles | Eliminations/ Reclassifications    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 0 0
Used vehicles | Automotive | Operating Segments    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 80 241
Used vehicles | Automotive | Operating Segments | GMNA    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 75 228
Used vehicles | Automotive | Operating Segments | GMI    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 5 13
Used vehicles | Automotive | Corporate    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 0 0
Services and other    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 1,153 1,105
Services and other | Operating Segments | Cruise    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 26 30
Services and other | Eliminations/ Reclassifications    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue (25) (25)
Services and other | Automotive | Operating Segments    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 1,152 1,100
Services and other | Automotive | Operating Segments | GMNA    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 809 809
Services and other | Automotive | Operating Segments | GMI    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue 295 272
Services and other | Automotive | Corporate    
Disaggregation of Revenue [Line Items]    
Automotive net sales and revenue $ 48 $ 19