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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Automotive [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	$ 5,133		$ 5,133		$ 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	32	$ 27	171	$ 153
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	994		994		827
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	4,327		4,327		2,710
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	761		761		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		45
GM Financial [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	107,601		107,601		113,871
Collateral available for netting					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	13,046		13,046		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] | Interest Rate Swap [Member] | Fair Value Level 2 [Member] | Other assets [Member]
Derivative [Line Items]
Fair value of derivative instruments	390		390
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	1,822		1,822		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	504		504		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	3,317		3,317		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	88,912		88,912		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	378		378		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	$ 240		$ 240		$ 372

X

- Definition

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

+ References

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

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-Topic 210
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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
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