GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Gross goodwill balance, December 31, 2020	$ 3,129
Accumulated impairment losses, December 31, 2020		$ (502)
Net goodwill balance, December 31, 2020	3,285	2,627
Acquisition	707
Measurement period adjustments	40
Held for sale	(18)
Other, primarily translation adjustment	(71)
Ending balance, September 30, 2021	3,285
Air Management
Goodwill [Roll Forward]
Gross goodwill balance, December 31, 2020	1,517
Accumulated impairment losses, December 31, 2020		(502)
Net goodwill balance, December 31, 2020	1,682	1,015
Acquisition	707
Measurement period adjustments	(4)
Held for sale	0
Other, primarily translation adjustment	(36)
Ending balance, September 30, 2021	1,682
e-Propulsion & Drivetrain
Goodwill [Roll Forward]
Gross goodwill balance, December 31, 2020	1,313
Accumulated impairment losses, December 31, 2020		0
Net goodwill balance, December 31, 2020	1,292	1,313
Acquisition	0
Measurement period adjustments	28
Held for sale	(18)
Other, primarily translation adjustment	(31)
Ending balance, September 30, 2021	1,292
Aftermarket
Goodwill [Roll Forward]
Gross goodwill balance, December 31, 2020	299
Accumulated impairment losses, December 31, 2020		0
Net goodwill balance, December 31, 2020	311	$ 299
Acquisition	0
Measurement period adjustments	16
Held for sale	0
Other, primarily translation adjustment	(4)
Ending balance, September 30, 2021	$ 311

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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