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Derivative Financial Instruments - Derivative Financial Instruments (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 16, 2021
Automotive | Stellantis Warrants, Formerly Known as PSA Warrants | Stellantis N.V.
Derivative [Line Items]
Outstanding warrants (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
Contractual lockup period	5 years
Automotive | Not Designated as Hedges
Derivative [Line Items]
Derivative notional amount	$ 5,822	$ 2,585
Automotive | Not Designated as Hedges | Foreign Currency | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	4,228	2,195
Automotive | Not Designated as Hedges | Commodity | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	1,549	341
Automotive | Not Designated as Hedges | Stellantis Warrants, Formerly Known as PSA Warrants | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	45	49
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	1,100
Automotive Financing
Derivative [Line Items]
Derivative notional amount	133,971	129,566
Fair Value of Assets	1,017	1,823
Fair Value of Liabilities	691	672
Collateral	376	728
Automotive Financing | Designated as Hedges | Cash Flow Hedges | Interest Rate Swap | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	611	921
Fair Value of Assets	12	0
Fair Value of Liabilities	4	27
Automotive Financing | Designated as Hedges | Cash Flow Hedges | Foreign Currency Swaps | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	7,419	5,626
Fair Value of Assets	85	278
Fair Value of Liabilities	201	47
Automotive Financing | Designated as Hedges | Fair Value Hedges | Interest Rate Swap | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	15,058	10,064
Fair Value of Assets	74	463
Fair Value of Liabilities	88	13
Automotive Financing | Designated as Hedges | Fair Value Hedges | Foreign Currency Swaps | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	682	1,958
Fair Value of Assets	0	128
Fair Value of Liabilities	59	9
Automotive Financing | Not Designated as Hedges | Foreign Currency | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	148	0
Fair Value of Assets	0	0
Fair Value of Liabilities	0	0
Automotive Financing | Not Designated as Hedges | Interest Rate Contract | Fair Value Level 2
Derivative [Line Items]
Derivative notional amount	110,053	110,997
Fair Value of Assets	846	954
Fair Value of Liabilities	339	576
PSA Group | Nonoperating Income (Expense) | Automotive | Not Designated as Hedges
Derivative [Line Items]
Gain on derivative instruments	$ 316	$ 139	$ 154

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