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Derivative Financial Instruments - Notional Amounts for Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Automotive \| Stellantis N.V.
Derivative [Line Items]
Proceeds from exercise of warrants	$ 1,100
Automotive \| Stellantis N.V. \| Common Stock
Derivative [Line Items]
Number of shares called by warrants	69.1	69.1
Automotive \| Stellantis warrants, formerly known as PSA warrants \| Stellantis N.V.
Derivative [Line Items]
Warrants outstanding (in shares)	39.7	39.7
Automotive \| Not Designated as Hedges
Derivative [Line Items]
Notional	$ 5,676	$ 5,676		$ 5,822
Automotive \| Not Designated as Hedges \| PSA Group \| Interest Income and Other Non-Operating Income, Net
Derivative [Line Items]
(Losses) gains on derivative instruments		(363)	$ 333
Automotive \| Not Designated as Hedges \| Foreign currency \| Fair Value Level 2
Derivative [Line Items]
Notional	4,484	4,484		4,228
Automotive \| Not Designated as Hedges \| Commodity \| Fair Value Level 2
Derivative [Line Items]
Notional	1,192	1,192		1,549
Automotive \| Not Designated as Hedges \| Stellantis warrants, formerly known as PSA warrants \| Fair Value Level 2
Derivative [Line Items]
Notional	0	0		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				1,400
GM Financial
Derivative [Line Items]
Notional	135,369	135,369		133,971
Fair Value of Assets	2,280	2,280		1,017
Fair Value of Liabilities	3,867	3,867		691
Collateral	471	471		376
Collateral available for netting	1,400	1,400
GM Financial \| Designated as Hedges \| Fair Value Hedges \| Interest rate swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	20,950	20,950		15,058
Fair Value of Assets	0	0		74
Fair Value of Liabilities	864	864		88
GM Financial \| Designated as Hedges \| Fair Value Hedges \| Foreign currency swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	0	0		682
Fair Value of Assets	0	0		0
Fair Value of Liabilities	0	0		59
GM Financial \| Designated as Hedges \| Cash Flow Hedges \| Interest rate swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	1,117	1,117		611
Fair Value of Assets	26	26		12
Fair Value of Liabilities	3	3		4
GM Financial \| Designated as Hedges \| Cash Flow Hedges \| Foreign currency swaps \| Fair Value Level 2
Derivative [Line Items]
Notional	6,329	6,329		7,419
Fair Value of Assets	4	4		85
Fair Value of Liabilities	1,036	1,036		201
GM Financial \| Not Designated as Hedges \| Foreign currency \| Fair Value Level 2
Derivative [Line Items]
Notional	0	0		148
Fair Value of Assets	0	0		0
Fair Value of Liabilities	0	0		0
GM Financial \| Not Designated as Hedges \| Interest rate contracts \| Fair Value Level 2
Derivative [Line Items]
Notional	106,973	106,973		110,053
Fair Value of Assets	2,250	2,250		846
Fair Value of Liabilities	$ 1,965	$ 1,965		$ 339