Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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Period Type:	instant

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Automotive [Member] \| Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	$ 4,383		$ 3,413
Automotive [Member] \| Not Designated as Hedges [Member] \| PSA Group [Member] \| Interest Income and Other Non-Operating Income, Net [Member]
Derivative [Line Items]
Gains on derivative instruments	139	$ 127
Automotive [Member] \| Not Designated as Hedges [Member] \| Fair Value Level 2 [Member] \| PSA Group [Member] \| Other assets [Member]
Derivative [Line Items]
Fair value of derivative instruments	950		827
Automotive [Member] \| Not Designated as Hedges [Member] \| Foreign Currency [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	3,500		2,710
Automotive [Member] \| Not Designated as Hedges [Member] \| Commodity [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	838		658
Automotive [Member] \| Not Designated as Hedges [Member] \| PSA Warrants [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	45		45
GM Financial [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	115,029		113,871
Collateral available for netting	284		451
GM Financial [Member] \| Designated as Hedges [Member] \| Fair Value Hedges [Member] \| Interest Rate Swap [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	13,039		9,533
GM Financial [Member] \| Designated as Hedges [Member] \| Fair Value Hedges [Member] \| Interest Rate Swap [Member] \| Fair Value Level 2 [Member] \| Other liabilities [Member]
Derivative [Line Items]
Fair value of derivative instruments			291
GM Financial [Member] \| Designated as Hedges [Member] \| Fair Value Hedges [Member] \| Foreign Currency Swaps [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	1,797		1,829
GM Financial [Member] \| Designated as Hedges [Member] \| Cash Flow Hedges [Member] \| Interest Rate Swap [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	599		768
GM Financial [Member] \| Designated as Hedges [Member] \| Cash Flow Hedges [Member] \| Foreign Currency Swaps [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	3,298		2,075
GM Financial [Member] \| Not Designated as Hedges [Member] \| Interest Rate Contract [Member] \| Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	96,296		99,666
GM Financial [Member] \| Not Designated as Hedges [Member] \| Interest Rate Contract [Member] \| Fair Value Level 2 [Member] \| Other liabilities [Member]
Derivative [Line Items]
Fair value of derivative instruments	428		520
GM Financial [Member] \| Not Designated as Hedges [Member] \| Interest Rate Contract [Member] \| Fair Value Level 2 [Member] \| Other assets [Member]
Derivative [Line Items]
Fair value of derivative instruments	$ 233		$ 372