INTERIM FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ 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, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									$ 14,198	$ 12,635	$ 11,803
Gross profit									2,568	2,369	2,173
Operating income									1,160	1,009	914
Amounts attributable to BorgWarner Inc.:
Net earnings from continuing operations	$ 149	$ 87	$ 230	$ 166	$ 172	$ 173	$ 161	$ 130	632	636	343
Net earnings (loss) from discontinued operations	5	(37)	(26)	51	82	102	54	70	(7)	308	194
Net earnings	154	50	204	217	254	275	215	200	$ 625	$ 944	$ 537
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
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
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	3,522	3,622	3,671	3,383	3,317	3,226	3,013	3,079	$ 14,198	$ 12,635
Gross profit	659	652	679	578	639	607	548	575	2,568	2,369
Operating income	$ 281	$ 272	$ 334	$ 273	$ 265	$ 265	$ 209	$ 270	$ 1,160	$ 1,009
Amounts attributable to BorgWarner Inc.:
Earnings per share from continuing operations — basic (in dollar per share)	$ 0.64	$ 0.37	$ 0.99	$ 0.72	$ 0.74	$ 0.74	$ 0.68	$ 0.55	$ 2.71	$ 2.70
Earnings per share from discontinued operations — basic (in dollar per share)	0.02	(0.16)	(0.11)	0.21	0.35	0.43	0.23	0.29	(0.03)	1.31
Earnings per share attributable to BorgWarner Inc. — basic (in dollar per share)	0.67	0.21	0.87	0.93	1.09	1.17	0.91	0.84	2.68	4.01
Earnings per share from continuing operations — diluted (in dollar per share)	0.64	0.37	0.97	0.72	0.73	0.73	0.68	0.54	2.70	2.69
Earnings per share from discontinued operations — diluted (in dollar per share)	0.02	(0.16)	(0.10)	0.21	0.36	0.42	0.23	0.30	(0.03)	1.30
Earnings per share attributable to BorgWarner Inc. — diluted (in dollar per share)	$ 0.66	$ 0.21	$ 0.87	$ 0.93	$ 1.09	$ 1.15	$ 0.91	$ 0.84	$ 2.67	$ 3.99