Revenue - Major Source (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 36,646	$ 32,824
Leased vehicle income	1,818	2,066
Finance charge income	1,366	1,010
Other income	155	79
GM Financial net sales and revenue	3,339	3,155
Net sales and revenue	39,985	35,979
Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	25	26
Net sales and revenue	25	26
Operating Segments | GM Financial
Disaggregation of Revenue [Line Items]
Leased vehicle income	1,818	2,066
Finance charge income	1,368	1,010
Other income	156	80
GM Financial net sales and revenue	3,343	3,156
Net sales and revenue	3,343	3,156
Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(25)	(25)
Leased vehicle income	0	0
Finance charge income	(3)	0
Other income	(1)	(1)
GM Financial net sales and revenue	(4)	(1)
Net sales and revenue	(29)	(26)
Automotive
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	36,646	32,824
Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	36,646	32,823
Net sales and revenue	36,646	32,823
Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	32,889	29,456
Net sales and revenue	32,889	29,456
Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	3,727	3,313
Net sales and revenue	3,727	3,313
Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	31	53
Net sales and revenue	31	53
Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	35,227	31,591
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	35,227	31,591
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	31,876	28,572
Vehicle, parts and accessories | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	3,342	3,014
Vehicle, parts and accessories | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	9	5
Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	180	80
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	180	80
Used vehicles | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	175	75
Used vehicles | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	5	5
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	1,239	1,153
Services and other | Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	25	26
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	1,239	1,152
Services and other | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	837	809
Services and other | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	380	295
Services and other | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 22	$ 48