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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 $ 133,045    
Total net sales and revenue (Note 3) $ 38,399 $ 35,791 $ 36,760 $ 36,099 $ 37,715 $ 33,623 $ 36,984 $ 37,266 147,049 $ 145,588 $ 149,184
Operating Segments [Member] | GM Financial [Member]                      
Disaggregation of Revenue [Line Items]                      
Leased vehicle income                 9,963    
Finance charge income                 3,629    
Other income                 424    
Total net sales and revenue (Note 3)                 14,016 12,151 8,983
Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 (98)    
Leased vehicle income                 0    
Finance charge income                 (8)    
Other income                 (4)    
Total net sales and revenue (Note 3)                 (110) (170) (4)
Automotive [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 133,045 133,449 140,205
Automotive [Member] | Operating Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 133,143    
Total net sales and revenue (Note 3)                 133,143 133,607 140,205
Automotive [Member] | Operating Segments [Member] | GMNA [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 113,792    
Total net sales and revenue (Note 3)                 113,792 111,345 119,113
Automotive [Member] | Operating Segments [Member] | GMI [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 19,148    
Total net sales and revenue (Note 3)                 19,148 21,920 20,943
Automotive [Member] | Corporate [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 203    
Total net sales and revenue (Note 3)                 203 342 149
GM Financial [Member]                      
Disaggregation of Revenue [Line Items]                      
Leased vehicle income                 9,963    
Finance charge income                 3,621    
Other income                 420    
Total net sales and revenue (Note 3)                 14,004 $ 12,139 $ 8,979
GM Financial [Member] | Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Total net sales and revenue (Note 3)                 (12)    
Vehicles and Parts [Member] | Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 (62)    
Vehicles and Parts [Member] | Automotive [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 125,155    
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 125,217    
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 107,217    
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 17,980    
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 20    
Used Vehicles [Member] | Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 (36)    
Used Vehicles [Member] | Automotive [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 3,354    
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 3,390    
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 3,215    
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 175    
Used Vehicles [Member] | Automotive [Member] | Corporate [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 0    
Services and Other [Member] | Eliminations [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 0    
Services and Other [Member] | Automotive [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 4,536    
Services and Other [Member] | Automotive [Member] | Operating Segments [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 4,536    
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 3,360    
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 993    
Services and Other [Member] | Automotive [Member] | Corporate [Member]                      
Disaggregation of Revenue [Line Items]                      
Automotive net sales and revenue                 $ 183