GOODWILL AND OTHER INTANGIBLES - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in the carrying amount of goodwill
Net goodwill balance, January 1	$ 1,842
Ending balance, December 31	$ 2,627	$ 1,842
Goodwill impairment test, weighted average cost of capital discount rate for future cash flow	11.70%
Air Management
Changes in the carrying amount of goodwill
Gross goodwill balance, January 1	$ 1,337	1,343
Accumulated impairment losses, January 1		(502)	$ (502)
Net goodwill balance, January 1	835	841
Acquisitions	151	0
Translation adjustment and other	29	(6)
Ending balance, December 31	1,015	835
e-Propulsion & Drivetrain
Changes in the carrying amount of goodwill
Gross goodwill balance, January 1	1,007	1,012
Accumulated impairment losses, January 1		0	$ 0
Net goodwill balance, January 1	1,007	1,012
Acquisitions	272	7
Translation adjustment and other	34	(12)
Ending balance, December 31	1,313	1,007
Fuel Injection
Changes in the carrying amount of goodwill
Gross goodwill balance, January 1	0
Accumulated impairment losses, January 1		0
Net goodwill balance, January 1	0
Acquisitions	0
Translation adjustment and other	0
Ending balance, December 31		0
Aftermarket
Changes in the carrying amount of goodwill
Gross goodwill balance, January 1	0
Accumulated impairment losses, January 1		0
Net goodwill balance, January 1	0
Acquisitions	287
Translation adjustment and other	12
Ending balance, December 31	$ 299	$ 0

Discount Rate for Weighted Average Cost of Capital.

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- Definition

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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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before 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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Amount of accumulated impairment loss for 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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