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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Automotive $ 32,691 $ 34,519
Leased vehicle income 2,447  
Finance charge income 864  
Other income 97  
GM Financial 3,408 2,747
Total net sales and revenue (Note 3) 36,099 37,266
GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial 3,408  
Group [Member] | Automotive [Member] | Operating Segments [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 32,715  
Leased vehicle income 0  
Finance charge income 0  
Other income 0  
Total net sales and revenue (Note 3) 32,715 34,650
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 27,818  
Leased vehicle income 0  
Finance charge income 0  
Other income 0  
Total net sales and revenue (Note 3) 27,818 29,338
Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 4,848  
Leased vehicle income 0  
Finance charge income 0  
Other income 0  
Total net sales and revenue (Note 3) 4,848 5,138
Group [Member] | Automotive [Member] | Corporate [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 49  
Leased vehicle income 0  
Finance charge income 0  
Other income 0  
Total net sales and revenue (Note 3) 49 174
Group [Member] | GM Financial [Member] | Operating Segments [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial 0  
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GMNA [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial 0  
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GMI [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial 0  
Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 0  
Leased vehicle income 2,447  
Finance charge income 866  
Other income 98  
GM Financial 3,411  
Total net sales and revenue (Note 3) 3,411 2,748
Group [Member] | GM Financial [Member] | Corporate [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial 0  
Eliminations [Member]    
Disaggregation of Revenue [Line Items]    
Automotive (24)  
Leased vehicle income 0  
Finance charge income (2)  
Other income (1)  
Total net sales and revenue (Note 3) (27) $ (132)
Eliminations [Member] | GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
GM Financial (3)  
Vehicles and Parts [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 30,489  
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 30,496  
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 25,882  
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 4,605  
Vehicles and Parts [Member] | Group [Member] | Automotive [Member] | Corporate [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 9  
Vehicles and Parts [Member] | Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 0  
Vehicles and Parts [Member] | Eliminations [Member]    
Disaggregation of Revenue [Line Items]    
Automotive (7)  
Used Vehicles [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 1,185  
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 1,202  
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 1,155  
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 47  
Used Vehicles [Member] | Group [Member] | Automotive [Member] | Corporate [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 0  
Used Vehicles [Member] | Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 0  
Used Vehicles [Member] | Eliminations [Member]    
Disaggregation of Revenue [Line Items]    
Automotive (17)  
Services and Other [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 1,017  
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 1,017  
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 781  
Services and Other [Member] | Group [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 196  
Services and Other [Member] | Group [Member] | Automotive [Member] | Corporate [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 40  
Services and Other [Member] | Group [Member] | GM Financial [Member] | Operating Segments [Member] | GM Financial [Member]    
Disaggregation of Revenue [Line Items]    
Automotive 0  
Services and Other [Member] | Eliminations [Member]    
Disaggregation of Revenue [Line Items]    
Automotive $ 0