CONTINGENCIES (Details) $ in Millions		12 Months Ended
	Oct. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) site	Dec. 31, 2019 USD ($) site	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Waste disposal sites | site		26	14
Accrual for environmental loss contingencies		$ 7	$ 3
Gain on derecognition of subsidiary		0	177	$ 0
Liability for unpaid claims and claims adjustment expense, claims paid			38	46
Asbestos-related adjustments		0	0	$ 23
Loss contingency, loss in period		1
BorgWarner Morse TEC LLC
Loss Contingencies [Line Items]
Ownership percentage transferred (in percent)	100.00%
Cash and cash equivalents	$ 172	172
Gain on derecognition of subsidiary			$ 177
Tax expense on derecognition of subsidiary	173
Gain on derecognition of subsidiary, net	$ 4	$ 4