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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 16, 2021	Dec. 31, 2020
Automotive | Stellantis warrants, formerly known as PSA warrants | Stellantis N.V.
Derivative [Line Items]
Warrants outstanding (in shares)			39.7
Automotive | Stellantis warrants, formerly known as PSA warrants | Stellantis N.V. | Common Stock
Derivative [Line Items]
Number of shares called by warrants			69.2
Automotive | Not Designated as Hedges
Derivative [Line Items]
Notional	$ 2,641			$ 2,585
Automotive | Not Designated as Hedges | PSA Group | Interest Income and Other Non-Operating Income, Net
Derivative [Line Items]
Gains (losses) on derivative instruments	210	$ (417)
Automotive | Not Designated as Hedges | Fair Value Level 2 | PSA Group | Other assets
Derivative [Line Items]
Fair value of derivative instruments	1,300			1,100
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2
Derivative [Line Items]
Notional	1,963			2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Notional	631			341
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2
Derivative [Line Items]
Notional	47			49
GM Financial
Derivative [Line Items]
Notional	134,372			129,566
Fair Value of Assets	1,374			1,823
Fair Value of Liabilities	777			672
Collateral	450			728
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	14,309			10,064
Fair Value of Assets	251			463
Fair Value of Liabilities	171			13
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	1,881			1,958
Fair Value of Assets	81			128
Fair Value of Liabilities	37			9
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	878			921
Fair Value of Assets	2			0
Fair Value of Liabilities	18			27
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	6,343			5,626
Fair Value of Assets	201			278
Fair Value of Liabilities	98			47
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2
Derivative [Line Items]
Notional	110,961			110,997
Fair Value of Assets	839			954
Fair Value of Liabilities	$ 453			$ 576

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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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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