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Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 16, 2021
Derivative [Line Items]
Outstanding warrants (in shares)			15.0
Automotive | Not Designated as Hedges
Derivative [Line Items]
Derivative notional amount	$ 2,585	$ 5,926
Automotive | Not Designated as Hedges | Foreign Currency | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	2,195	5,075
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	341	806
Automotive | Not Designated as Hedges | PSA Warrants | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	49	45
Automotive | Not Designated as Hedges | Fair Value Hedges | PSA Warrants | Fair Value Level 2
Derivative [Line Items]
Fair Value of Assets	1,100	964
GM Financial
Derivative [Line Items]
Derivative notional amount	129,566	108,673
Fair Value of Assets	1,823	636
Fair Value of Liabilities	672	519
Collateral	728	210
GM Financial | Designated as Hedges | Cash Flow Hedges | Interest Rate Swap | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	921	590
Fair Value of Assets	0	0
Fair Value of Liabilities	27	6
GM Financial | Designated as Hedges | Cash Flow Hedges | Foreign Currency Swaps | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	5,626	4,429
Fair Value of Assets	278	40
Fair Value of Liabilities	47	119
GM Financial | Designated as Hedges | Fair Value Hedges | Interest Rate Swap | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	10,064	9,458
Fair Value of Assets	463	234
Fair Value of Liabilities	13	23
GM Financial | Designated as Hedges | Fair Value Hedges | Foreign Currency Swaps | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	1,958	1,796
Fair Value of Assets	128	22
Fair Value of Liabilities	9	71
GM Financial | Not Designated as Hedges | Interest Rate Contract | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	110,997	92,400
Fair Value of Assets	954	340
Fair Value of Liabilities	576	300
PSA Group | Subsequent Event
Derivative [Line Items]
Outstanding warrants (in shares)				39.7
PSA Group | Nonoperating Income (Expense) | Automotive | Not Designated as Hedges
Derivative [Line Items]
Gain on derivative instruments	$ 139	$ 154	$ 116
Stellantis N.V. | Subsequent Event
Derivative [Line Items]
Outstanding warrants (in shares)				69.2

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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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