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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Automotive [Member]
Debt Instrument [Line Items]
Carrying Amount	$ 15,963	$ 13,502
Fair Value	16,352	15,088
Automotive [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Fair Value	13,971	13,202
Automotive [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	2,381	1,886
GM Financial [Member]
Debt Instrument [Line Items]
Carrying Amount	86,377	80,717
Fair Value	86,741	81,937
GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	39,722	39,887
Fair Value	39,679	39,948
GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	46,655	40,830
Fair Value	47,062	41,989
GM Financial [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	84,693	79,623
GM Financial [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Fair Value	$ 2,048	$ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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