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Revenue - Major Source (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Total net sales and revenue (Note 2) $ 36,060 $ 36,760 $ 70,938 $ 72,859
Operating Segments [Member] | GM Cruise [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25   50  
Total net sales and revenue (Note 2) 25 0 50 0
Operating Segments [Member] | GM Financial [Member]        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,512 2,497 5,021 4,944
Finance charge income 1,008 884 1,995 1,750
Other income 119 107 243 205
Total net sales and revenue (Note 2) 3,639 3,488 7,259 6,899
Eliminations/ Reclassifications [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) (34) (50) (58)
Leased vehicle income 0 0 0 0
Finance charge income (2) (1) (4) (3)
Other income (2) (2) (3) (3)
Total net sales and revenue (Note 2) (29) (37) (57) (64)
Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,425 33,275 63,686 65,966
Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 32,425 33,309 63,686 66,024
Total net sales and revenue (Note 2) 32,425 33,309 63,686 66,024
Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 28,324 28,501 55,689 56,319
Total net sales and revenue (Note 2) 28,324 28,501 55,689 56,319
Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 4,047 4,758 7,897 9,606
Total net sales and revenue (Note 2) 4,047 4,758 7,897 9,606
Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 54 50 100 99
Total net sales and revenue (Note 2) 54 50 100 99
GM Financial [Member]        
Disaggregation of Revenue [Line Items]        
Leased vehicle income 2,512 2,497 5,021 4,944
Finance charge income 1,006 883 1,991 1,747
Other income 117 105 240 202
Total net sales and revenue (Note 2) 3,635 3,485 7,252 6,893
GM Financial [Member] | Eliminations/ Reclassifications [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales and revenue (Note 2) (4) (3) (7) (6)
Vehicles and Parts [Member] | Eliminations/ Reclassifications [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 (18) 0 (25)
Vehicles and Parts [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,720 31,346 60,249 61,835
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 30,720 31,364 60,249 61,860
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 26,976 26,874 52,938 52,756
Vehicles and Parts [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 3,744 4,489 7,311 9,094
Vehicles and Parts [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 1 0 10
Used Vehicles [Member] | Eliminations/ Reclassifications [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 (16) 0 (33)
Used Vehicles [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 606 821 1,268 2,006
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 606 837 1,268 2,039
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 577 769 1,204 1,924
Used Vehicles [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 29 68 64 115
Used Vehicles [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 0 0 0 0
Services and Other [Member] | Operating Segments [Member] | GM Cruise [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 25   50  
Services and Other [Member] | Eliminations/ Reclassifications [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue (25) 0 (50) 0
Services and Other [Member] | Automotive [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,099 1,108 2,169 2,125
Services and Other [Member] | Automotive [Member] | Operating Segments [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 1,099 1,108 2,169 2,125
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMNA [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 771 858 1,547 1,639
Services and Other [Member] | Automotive [Member] | Operating Segments [Member] | GMI [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue 274 201 522 397
Services and Other [Member] | Automotive [Member] | Corporate [Member]        
Disaggregation of Revenue [Line Items]        
Automotive net sales and revenue $ 54 $ 49 $ 100 $ 89