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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Automotive [Member] | Not Designated as Hedges [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	$ 6,052		$ 6,052		$ 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	51	$ 171	222	$ 324
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	1,000		1,000		827
Automotive [Member] | Not Designated as Hedges [Member] | Foreign Currency [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	5,251		5,251		2,710
Automotive [Member] | Not Designated as Hedges [Member] | Commodity [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	758		758		658
Automotive [Member] | Not Designated as Hedges [Member] | PSA Warrants [Member] | Fair Value Level 2 [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	43		43		45
GM Financial [Member]
Derivative [Line Items]
Notional amount, derivative financial instruments	104,116		104,116		113,871
Collateral	258		258
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	10,702		10,702		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	384		384
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	1,744		1,744		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	553		553		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	4,269		4,269		2,075
GM Financial [Member] | Not Designated as Hedges [Member] | Foreign Currency Swaps [Member] | Fair Value Level 2 [Member] | Other liabilities [Member]
Derivative [Line Items]
Fair value of derivative instruments	(241)		(241)
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	86,848		86,848		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	(384)		(384)		(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	$ 302		$ 302		$ 372

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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.

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

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