Revenue - Revenue by Major Source (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 39,861	$ 39,212
Leased vehicle income	1,902	1,800
Finance charge income	2,021	1,778
Other income	236	224
GM Financial net sales and revenue	4,159	3,802
Net sales and revenue	44,020	43,014
Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	38,268	37,663
Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	325	234
Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,269	1,316
Operating Segments \| Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1	25
Net sales and revenue	1	25
Operating Segments \| GM Financial
Disaggregation of Revenue [Line Items]
Leased vehicle income	1,902	1,800
Finance charge income	2,025	1,786
Other income	237	225
GM Financial net sales and revenue	4,164	3,811
Net sales and revenue	4,164	3,811
Operating Segments \| Services and other \| Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1	25
Eliminations/Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	(25)
Leased vehicle income	0	0
Finance charge income	(4)	(8)
Other income	(1)	(1)
GM Financial net sales and revenue	(5)	(9)
Net sales and revenue	(5)	(34)
Eliminations/Reclassifications \| Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0
Eliminations/Reclassifications \| Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0
Eliminations/Reclassifications \| Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	(25)
Automotive
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	39,861	39,212
Automotive \| Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	39,860	39,212
Net sales and revenue	39,860	39,212
Automotive \| Operating Segments \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	37,388	36,099
Net sales and revenue	37,388	36,099
Automotive \| Operating Segments \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	2,427	3,082
Net sales and revenue	2,427	3,082
Automotive \| Operating Segments \| Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	38,268	37,663
Automotive \| Operating Segments \| Vehicle, parts and accessories \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	36,125	34,898
Automotive \| Operating Segments \| Vehicle, parts and accessories \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	2,125	2,760
Automotive \| Operating Segments \| Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	325	234
Automotive \| Operating Segments \| Used vehicles \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	317	229
Automotive \| Operating Segments \| Used vehicles \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	8	5
Automotive \| Operating Segments \| Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	1,268	1,315
Automotive \| Operating Segments \| Services and other \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	946	972
Automotive \| Operating Segments \| Services and other \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	294	316
Automotive \| Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	46	32
Net sales and revenue	46	32
Automotive \| Corporate \| Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	18	5
Automotive \| Corporate \| Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	0	0
Automotive \| Corporate \| Services and other
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	28	27
Automotive \| Eliminations/Reclassifications
Disaggregation of Revenue [Line Items]
Net sales and revenue	$ 0	$ 0

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