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Revenue - Major Source (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 29,067	$ 29,150
Leased vehicle income	2,321	2,463
Finance charge income	1,016	1,005
Other income	70	91
GM Financial net sales and revenue	3,407	3,559
Net sales and revenue	32,474	32,709
Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	30	25
Net sales and revenue	30	25
Operating Segments | GM Financial
Disaggregation of Revenue [Line Items]
Leased vehicle income	2,321	2,463
Finance charge income	1,016	1,006
Other income	70	92
GM Financial net sales and revenue	3,407	3,561
Net sales and revenue	3,407	3,561
Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(25)	(24)
Leased vehicle income	0	0
Finance charge income	0	(1)
Other income	0	(1)
GM Financial net sales and revenue	0	(2)
Net sales and revenue	(25)	(26)
Automotive
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	29,067	29,150
Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	29,062	29,149
Net sales and revenue	29,062	29,149
Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	25,957	25,831
Net sales and revenue	25,957	25,831
Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	3,086	3,280
Net sales and revenue	3,086	3,280
Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	19	38
Net sales and revenue	19	38
Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	27,721	27,574
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	27,721	27,574
Vehicle, parts and accessories | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	24,920	24,576
Vehicle, parts and accessories | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	2,801	2,998
Vehicle, parts and accessories | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0
Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	241	403
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	241	403
Used vehicles | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	228	376
Used vehicles | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	13	25
Used vehicles | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	2
Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,105	1,173
Services and other | Operating Segments | Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	30	25
Services and other | Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(25)	(24)
Services and other | Automotive | Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,100	1,172
Services and other | Automotive | Operating Segments | GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	809	879
Services and other | Automotive | Operating Segments | GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	272	257
Services and other | Automotive | Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 19	$ 36

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Interest and fee income generated from consumer loans. Consumer loans are loans to individuals for household, family, and other personal expenditures. Such loans include residential mortgages, home equity lines-of-credit, automobiles and marine transport loans, credit card transactions, and others.

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