RELATED PARTY INFORMATION - Schedule of Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Related Party Transaction [Line Items]
Net sales	$ 5,332	$ 5,396	$ 16,062	$ 15,189
Cost of goods sold	4,059	4,156	12,133	11,819
Selling, general and administrative expenses	462	422	1,385	1,224
Trade receivables, net	199		199		$ 172
Receivables from Iveco Group N.V.	229		229		298
Trade payables	3,574		3,574		3,702
Payables to Iveco Group N.V.	76		76		156
Stellantis | Related Party
Related Party Transaction [Line Items]
Net sales	0	0	0	0
Cost of goods sold	1	3	7	14
Selling, general and administrative expenses	7	11	29	36
Trade receivables, net	0		0		0
Trade payables	12		12		14
Iveco Group post-Demerger | Related Party
Related Party Transaction [Line Items]
Net sales	68	12	125	33
Cost of goods sold	274	218	808	721
Trade receivables, net	24		24		21
Receivables from Iveco Group N.V.	229		229		298
Trade payables	206		206		184
Payables to Iveco Group N.V.	76		76		156
Unconsolidated subsidiaries and affiliates | Related Party
Related Party Transaction [Line Items]
Net sales	137	79	430	301
Cost of goods sold	171	$ 138	497	$ 382
Trade receivables, net	1		1		0
Trade payables	$ 91		$ 91		$ 100