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Revenue - Disaggregation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 108,673	$ 122,697	$ 133,045
Leased vehicle income	9,530	10,032	9,963
Finance charge income	3,995	4,064	3,621
Other income	287	444	420
GM Financial net sales and revenue	13,812	14,540	14,004
Net sales and revenue	122,485	137,237	147,049
Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	103	100
Net sales and revenue	103	100	0
Operating Segments | GM Financial
Disaggregation of Revenue [Line Items]
Leased vehicle income	9,530	10,032	9,963
Finance charge income	3,996	4,071	3,629
Other income	305	451	424
GM Financial net sales and revenue	13,831	14,554	14,016
Net sales and revenue	13,831	14,554	14,016
Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(99)	(100)	(98)
Leased vehicle income	0	0	0
Finance charge income	(1)	(7)	(8)
Other income	(18)	(7)	(4)
GM Financial net sales and revenue	(19)	(14)	(12)
Net sales and revenue	(118)	(114)	(110)
Automotive
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	108,673	122,697	133,045
Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	108,669	122,697	133,143
Net sales and revenue	108,669	122,697	133,143
Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	96,733	106,366	113,792
Net sales and revenue	96,733	106,366	113,792
Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	11,586	16,111	19,148
Net sales and revenue	11,586	16,111	19,148
Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	350	220	203
Net sales and revenue	350	220	203
Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	103,343	116,277	125,155
Vehicle, parts and accessories | Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0	(62)
Vehicle, parts and accessories | Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	103,343	116,277	125,217
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	92,749	101,346	107,217
Vehicle, parts and accessories | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	10,593	14,931	17,980
Vehicle, parts and accessories | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1	0	20
Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,010	2,019	3,354
Used vehicles | Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0	(36)
Used vehicles | Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,010	2,019	3,390
Used vehicles | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	875	1,896	3,215
Used vehicles | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	115	123	175
Used vehicles | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	20	0	0
Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	4,320	4,401	4,536
Services and other | Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	103	100
Services and other | Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(99)	(100)	0
Services and other | Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	4,316	4,401	4,536
Services and other | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	3,109	3,124	3,360
Services and other | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	878	1,057	993
Services and other | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 329	$ 220	$ 183

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