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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Automotive [Member]
Debt Instrument [Line Items]
Carrying Amount	$ 13,819	$ 13,502
Fair Value	14,362	15,088
Automotive [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Fair Value	12,042	13,202
Automotive [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	2,320	1,886
GM Financial [Member]
Debt Instrument [Line Items]
Carrying Amount	84,440	80,717
Fair Value	84,869	81,937
GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	39,083	39,887
Fair Value	39,024	39,948
GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	45,357	40,830
Fair Value	45,845	41,989
GM Financial [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	82,604	79,623
GM Financial [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Fair Value	$ 2,265	$ 2,314

X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

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-Name Accounting Standards Codification
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