GOODWILL AND OTHER INTANGIBLES - Intangible assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated Fair Value				$ 1,286	$ 645
Amortized intangible assets, accumulated amortization	$ 298	$ 266	$ 266	356	298
Amortized intangible assets, net				930	347
Intangible Assets, Gross (Excluding Goodwill)	700	705	705	1,452	700
Other intangible assets, net				1,096	402
Amortized intangible assets, future amortization expense [Abstract]
Intangible asset accelerated amortization	89	39	40
Future amortization expense - 2021				81
Future amortization expense - 2022				80
Future amortization expense - 2023				74
Future amortization expense - 2024				73
Future amortization expense - 2025 and thereafter				622
Gross carrying amounts
Beginning balance, January 1	700	705
Acquisitions	760	5
Abandonment	(56)	0
Amortization	0	0
Translation adjustment	48	(10)
Ending balance, December 31	1,452	700	705
Accumulated amortization
Beginning balance, January 1	298	266
Acquisitions	0	0
Abandonment	(56)	0
Intangible asset accelerated amortization	89	39	40
Translation adjustment	25	(7)
Ending balance, December 31	356	298	$ 266
Delphi Technologies
Amortized intangible assets, future amortization expense [Abstract]
Intangible asset accelerated amortization	11
Accumulated amortization
Intangible asset accelerated amortization	11
Patented and unpatented technology
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated Fair Value				383	154
Amortized intangible assets, accumulated amortization	70	70		77	70
Amortized intangible assets, net				306	84
Accumulated amortization
Beginning balance, January 1	70
Ending balance, December 31	77	70
Customer relationships
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated Fair Value				893	481
Amortized intangible assets, accumulated amortization	224	224		272	224
Amortized intangible assets, net				621	257
Accumulated amortization
Beginning balance, January 1	224
Ending balance, December 31	272	224
Miscellaneous
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated Fair Value				10	10
Amortized intangible assets, accumulated amortization	4	4		7	4
Amortized intangible assets, net				3	6
Accumulated amortization
Beginning balance, January 1	4
Ending balance, December 31	$ 7	$ 4
Unamortized trade names
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Unamortized trade name				$ 166	$ 55
Minimum | Patented and unpatented technology
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	7 years
Minimum | Customer relationships
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	7 years
Minimum | Miscellaneous
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	1 year
Maximum | Patented and unpatented technology
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	15 years
Maximum | Customer relationships
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	15 years
Maximum | Miscellaneous
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Estimated useful lives (years)	13 years