CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales									$ 14,198	$ 12,635	$ 11,803
Cost of sales									11,630	10,266	9,630
Gross profit									2,568	2,369	2,173
Selling, general and administrative expenses									1,316	1,290	1,085
Restructuring expense									79	48	108
Other operating expense, net									13	22	66
Operating income									1,160	1,009	914
Equity in affiliates’ earnings, net of tax									(30)	(28)	(42)
Realized and unrealized loss on debt and equity securities									(174)	(73)	(362)
Interest expense, net									10	51	91
Other postretirement expense (income)									15	0	(7)
Earnings from continuing operations before income taxes and noncontrolling interest									991	913	510
Provision for income taxes									289	195	65
Net earnings from continuing operations									702	718	445
Net (loss) earnings from discontinued operations	$ 5	$ (37)	$ (26)	$ 51	$ 82	$ 102	$ 54	$ 70	(7)	308	194
Net earnings									695	1,026	639
Net earnings from continuing operations attributable to the noncontrolling interest, net of tax									70	82	102
Net earnings attributable to BorgWarner Inc.	154	50	204	217	254	275	215	200	625	944	537
Amounts attributable to BorgWarner Inc.:
Net earnings from continuing operations	$ 149	$ 87	$ 230	$ 166	$ 172	$ 173	$ 161	$ 130	$ 632	$ 636	$ 343
Basic earnings per share:
Earnings per share from continuing operations — basic (in dollar per share)									$ 2.71	$ 2.70	$ 1.44
Earnings per share from discontinued operations — basic (in dollar per share)									(0.03)	1.31	0.81
Earnings per share attributable to BorgWarner Inc. — basic (in dollar per share)									2.68	4.01	2.25
Diluted earnings per share:
Earnings per share from continuing operations — diluted (in dollar per share)									2.70	2.69	1.43
Earnings per share from discontinued operations — diluted (in dollar per share)									(0.03)	1.30	0.81
Earnings per share attributable to BorgWarner Inc. — diluted (in dollar per share)									$ 2.67	$ 3.99	$ 2.24
Weighted average shares outstanding:
Basic (in shares)									232.8	235.5	238.1
Diluted (in shares)									234.4	236.8	239.5