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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total net sales and revenue (Note 3) $ 35,791 $ 33,623 $ 108,650 $ 107,873
Operating Segments [Member] | GM Financial [Member]        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,501   7,445  
Finance charge income 917   2,667  
Other income 100   305  
Total net sales and revenue (Note 3) 3,518 3,161 10,417 8,899
Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (12)   (70)  
Leased vehicle income 0   0  
Finance charge income (2)   (5)  
Other income (1)   (4)  
Total net sales and revenue (Note 3) (15) (13) (79) (152)
Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,276 30,466 98,242 98,983
Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,288   98,312  
Total net sales and revenue (Note 3) 32,288 30,475 98,312 99,126
Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 27,650   83,969  
Total net sales and revenue (Note 3) 27,650 24,819 83,969 82,594
Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 4,582   14,188  
Total net sales and revenue (Note 3) 4,582 5,576 14,188 16,226
Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 56   155  
Total net sales and revenue (Note 3) 56 80 155 306
GM Financial [Member]        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,501   7,445  
Finance charge income 915   2,662  
Other income 99   301  
Total net sales and revenue (Note 3) 3,515 $ 3,157 10,408 $ 8,890
GM Financial [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales and revenue (Note 3) (3)   (9)  
Vehicles and Parts [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (11)   (36)  
Vehicles and Parts [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,490   92,325  
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,501   92,361  
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26,273   79,029  
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 4,226   13,320  
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 2   12  
Used Vehicles [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (1)   (34)  
Used Vehicles [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 604   2,610  
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 605   2,644  
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 582   2,506  
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 23   138  
Used Vehicles [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0   0  
Services and Other [Member] | Eliminations [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0   0  
Services and Other [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,182   3,307  
Services and Other [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,182   3,307  
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 795   2,434  
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 333   730  
Services and Other [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 54   $ 143