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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 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	$ 5,241		$ 5,241			$ 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	(31)	$ 76	333	$ (227)
Automotive | Not Designated as Hedges | Fair Value Level 2 | PSA Group | Other assets
Derivative [Line Items]
Fair value of derivative instruments	1,400		1,400			1,100
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2
Derivative [Line Items]
Notional	3,867		3,867			2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Notional	1,328		1,328			341
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2
Derivative [Line Items]
Notional	46		46			49
GM Financial
Derivative [Line Items]
Notional	134,338		134,338			129,566
Fair Value of Assets	1,094		1,094			1,823
Fair Value of Liabilities	666		666			672
Collateral	460		460			728
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	19,308		19,308			10,064
Fair Value of Assets	347		347			463
Fair Value of Liabilities	90		90			13
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	695		695			1,958
Fair Value of Assets	0		0			128
Fair Value of Liabilities	46		46			9
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	711		711			921
Fair Value of Assets	8		8			0
Fair Value of Liabilities	10		10			27
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	7,515		7,515			5,626
Fair Value of Assets	115		115			278
Fair Value of Liabilities	178		178			47
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2
Derivative [Line Items]
Notional	106,109		106,109			110,997
Fair Value of Assets	624		624			954
Fair Value of Liabilities	$ 342		$ 342			$ 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 right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities.

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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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