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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, 2022	Mar. 31, 2021	Dec. 31, 2021	Jan. 16, 2021
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	$ 6,090		$ 5,822
Automotive | Not Designated as Hedges | PSA Group | Interest Income and Other Non-Operating Income, Net
Derivative [Line Items]
Gains (losses) on derivative instruments	197	$ 210
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2
Derivative [Line Items]
Notional	4,377		4,228
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Notional	1,668		1,549
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2
Derivative [Line Items]
Notional	44		45
Automotive | Not Designated as Hedges | Fair Value Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2
Derivative [Line Items]
Fair Value of Assets	1,200		1,400
GM Financial
Derivative [Line Items]
Notional	136,674		133,971
Fair Value of Assets	1,353		1,017
Fair Value of Liabilities	1,368		691
Collateral	323		376
Collateral available for netting	432
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	19,310		15,058
Fair Value of Assets	11		74
Fair Value of Liabilities	345		88
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	0		682
Fair Value of Assets	0		0
Fair Value of Liabilities	0		59
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	709		611
Fair Value of Assets	17		12
Fair Value of Liabilities	4		4
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	7,945		7,419
Fair Value of Assets	79		85
Fair Value of Liabilities	221		201
GM Financial | Not Designated as Hedges | Foreign currency | Fair Value Level 2
Derivative [Line Items]
Notional	0		148
Fair Value of Assets	0		0
Fair Value of Liabilities	0		0
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2
Derivative [Line Items]
Notional	108,709		110,053
Fair Value of Assets	1,245		846
Fair Value of Liabilities	$ 797		$ 339

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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 cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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