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Segment Reporting Revenues and long-lived assets by geographic region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									$ 133,449	$ 140,205	$ 129,864
GM Financial revenue									12,139	8,979	5,861
Total net sales and revenue	$ 37,715	$ 33,623	$ 36,984	$ 37,266	$ 39,896	$ 38,889	$ 37,383	$ 33,016	145,588	149,184	135,725
Long-Lived Assets	80,329				68,055				80,329	68,055	50,990
Automotive [Member] | U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									100,674	110,661	100,082
Long-Lived Assets	24,473				22,241				24,473	22,241	21,091
Automotive [Member] | Non-U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales and revenue									32,775	29,544	29,782
Long-Lived Assets	12,715				11,258				12,715	11,258	9,649
GM Financial [Member] | U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
GM Financial revenue									10,489	7,462	4,357
Long-Lived Assets	40,674				32,506				40,674	32,506	18,501
GM Financial [Member] | Non-U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
GM Financial revenue									1,650	1,517	1,504
Long-Lived Assets	$ 2,467				$ 2,050				$ 2,467	$ 2,050	$ 1,749

X

- Definition

The aggregate financial services revenue and operating interest income earned during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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