Revenue - Major Source (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 39,212	$ 36,646
Leased vehicle income	1,800	1,818
Finance charge income	1,778	1,366
Other income	224	155
GM Financial net sales and revenue	3,802	3,339
Net sales and revenue	43,014	39,985
Operating Segments \| Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	25	25
Net sales and revenue	25	25
Operating Segments \| GM Financial
Disaggregation of Revenue [Line Items]
Leased vehicle income	1,800	1,818
Finance charge income	1,786	1,368
Other income	225	156
GM Financial net sales and revenue	3,811	3,343
Net sales and revenue	3,811	3,343
Eliminations/ Reclassifications
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	(25)	(25)
Leased vehicle income	0	0
Finance charge income	(8)	(3)
Other income	(1)	(1)
GM Financial net sales and revenue	(9)	(4)
Net sales and revenue	(34)	(29)
Automotive
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	39,212	36,646
Automotive \| Operating Segments
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	39,212	36,646
Net sales and revenue	39,212	36,646
Automotive \| Operating Segments \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	36,099	32,889
Net sales and revenue	36,099	32,889
Automotive \| Operating Segments \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	3,082	3,727
Net sales and revenue	3,082	3,727
Automotive \| Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	32	31
Net sales and revenue	32	31
Vehicle, parts and accessories
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	37,663	35,227
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	37,663	35,227
Vehicle, parts and accessories \| Automotive \| Operating Segments \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	34,898	31,876
Vehicle, parts and accessories \| Automotive \| Operating Segments \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	2,760	3,342
Vehicle, parts and accessories \| Automotive \| Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	5	9
Used vehicles
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	234	180
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	234	180
Used vehicles \| Automotive \| Operating Segments \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	229	175
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	1,316	1,239
Services and other \| Operating Segments \| Cruise
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	25	25
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	1,315	1,239
Services and other \| Automotive \| Operating Segments \| GMNA
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	972	837
Services and other \| Automotive \| Operating Segments \| GMI
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	316	380
Services and other \| Automotive \| Corporate
Disaggregation of Revenue [Line Items]
Automotive net sales and revenue	$ 27	$ 22

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