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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 4,164		$ 4,164			$ 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	154	$ 114	364	$ (303)
Automotive | Not Designated as Hedges | Fair Value Level 2 | PSA Group | Other assets
Derivative [Line Items]
Fair value of derivative instruments	1,500		1,500			1,100
Automotive | Not Designated as Hedges | Foreign currency | Fair Value Level 2
Derivative [Line Items]
Notional	3,024		3,024			2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Notional	1,093		1,093			341
Automotive | Not Designated as Hedges | Stellantis warrants, formerly known as PSA warrants | Fair Value Level 2
Derivative [Line Items]
Notional	47		47			49
GM Financial
Derivative [Line Items]
Notional	134,811		134,811			129,566
Fair Value of Assets	1,305		1,305			1,823
Fair Value of Liabilities	627		627			672
Collateral	509		509			728
GM Financial | Designated as Hedges | Fair Value Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	18,112		18,112			10,064
Fair Value of Assets	319		319			463
Fair Value of Liabilities	75		75			13
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	712		712			1,958
Fair Value of Assets	0		0			128
Fair Value of Liabilities	30		30			9
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest rate swaps | Fair Value Level 2
Derivative [Line Items]
Notional	835		835			921
Fair Value of Assets	4		4			0
Fair Value of Liabilities	14		14			27
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign currency swaps | Fair Value Level 2
Derivative [Line Items]
Notional	6,418		6,418			5,626
Fair Value of Assets	204		204			278
Fair Value of Liabilities	99		99			47
GM Financial | Not Designated as Hedges | Interest rate contracts | Fair Value Level 2
Derivative [Line Items]
Notional	108,734		108,734			110,997
Fair Value of Assets	778		778			954
Fair Value of Liabilities	$ 409		$ 409			$ 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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