CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Reclassification (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)										$ 13	$ 9	$ (11)
Income before income taxes and equity income										86	364	420
Income tax (expense) benefit										(57)	9	(106)
Net income		$ (34)	$ 17	$ 31	$ 19	$ 142	$ 43	$ 90	$ 105	33	380	319
Net income attributable to noncontrolling interest		6	3	4	3	7	4	4	7	16	22	34
Net income attributable to Delphi Technologies		$ (40)	$ 14	$ 27	$ 16	$ 135	$ 39	$ 86	$ 98	17	358	285
Pension and postretirement plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the year										(18)	(19)	(21)
Pension and postretirement plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax										(15)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense)	[1]									(7)	(24)	(26)
Income before income taxes and equity income										(22)	(24)	(26)
Income tax (expense) benefit										4	5	5
Net income										(18)	(19)	(21)
Net income attributable to noncontrolling interest										0	0	0
Net income attributable to Delphi Technologies										$ (18)	$ (19)	$ (21)

[1] (1) These accumulated other comprehensive loss components are components of net periodic pension cost (see Note 13. Pension Benefits for additional details).