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Subsequent Event (Details) - Subsequent Event [Member] - Honda Motor Co., Ltd [Member] - GM Cruise Holdings LLC [Member] - Common Class E [Member] $ in Millions	Oct. 03, 2018 USD ($)
Subsequent Event [Line Items]
Proceeds from issuance of common stock	$ 750
Ownership interest	5.70%
Agreed upon future contributions	$ 2,000

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- Definition

Number of Eligible Employees for the Voluntary severance program

+ References

No definition available.

+ Details

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X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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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.

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- Details

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- Details

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- Details

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- Details

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