INCOME TAXES - components of income tax expense (benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
U.S.	$ (423)	$ 437	$ 310
Non-U.S.	1,212	527	955
Earnings before income taxes and noncontrolling interest	789	964	1,265
Federal	43	19	32
State	7	2	4
Foreign	276	252	245
Total current expense	326	273	281
Federal	(98)	70	150
State	(13)	11	23
Foreign	(65)	43	14
Total deferred (benefit) expense	(176)	124	187
Provision for income taxes	150	397	468
Unrealized loss (gain) on equity securities	(362)	382	$ 0
BorgWarner Romeo Power LLC
Operating Loss Carryforwards [Line Items]
Unrealized loss (gain) on equity securities	$ (362)	$ 382