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Subsequent Events (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2021	Feb. 10, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Deferred tax assets valuation allowance			$ 9,095	$ 8,135
Subsequent Event | GM Cruise
Subsequent Event [Line Items]
Deferred tax assets valuation allowance		$ 350
Subsequent Event | Series G Preferred Shares | GM Cruise | Microsoft and other investors
Subsequent Event [Line Items]
Proceeds from sale of stock	$ 2,200
Subsequent Event | Series G Preferred Shares | GM Cruise | General Motors Holdings LLC
Subsequent Event [Line Items]
Proceeds from sale of stock	$ 1,000

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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