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Automotive and GM Financial Debt (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Automotive [Member]
Debt Instrument [Line Items]
Carrying Amount	$ 10,952	$ 10,752
Fair Value	11,913	11,612
Automotive [Member] | Level 1 [Member]
Debt Instrument [Line Items]
Fair Value	9,590	9,515
Automotive [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	2,323	2,097
GM Financial [Member]
Debt Instrument [Line Items]
Carrying Amount	79,949	73,876
Fair Value	81,070	74,577
GM Financial [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	42,579	39,270
Fair Value	42,680	39,357
GM Financial [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Carrying Amount	37,370	34,606
Fair Value	38,390	35,220
GM Financial [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Fair Value	77,267	69,990
GM Financial [Member] | Level 3 [Member]
Debt Instrument [Line Items]
Fair Value	$ 3,803	$ 4,587

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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-Name Accounting Standards Codification
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