SEGMENT REPORTING Reconciliation of Adjusted Operating Income to Net Income Attributable to Delphi Technologies (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	Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									$ 314	$ 548	$ 637
Restructuring									80	35	98
Separation Costs									(44)
Separation and transformation costs (2)										(78)	(81)
Asset impairments									(35)	(1)	(12)
Pension Cost (Reversal of Cost)									14
Operating income	$ (15)	$ 45	$ 56	$ 55	$ 93	$ 81	$ 122	$ 138	141	434	446
Interest expense									(68)	(79)	(15)
Other income, net									13	9	(11)
Income before income taxes and equity income									86	364	420
Income tax (expense) benefit									(57)	9	(106)
Equity income, net of tax									4	7	5
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
Delphi Technologies Aftermarket Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring									2	(2)	6
Delphi Technologies FIS Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring									32	29	79
Delphi Technologies PTP Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring									17	6	8
Delphi Technologies E&E Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Restructuring									25	0	5
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Asset impairments									(23)		(12)
Operating segments | Delphi Technologies Aftermarket Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									86	97	94
Restructuring									2	2	6
Separation Costs									(1)
Separation and transformation costs (2)										(5)
Asset impairments									(1)	0	0
Pension Cost (Reversal of Cost)									(1)
Operating income									81	94	88
Equity income, net of tax									0	0	0
Net income attributable to noncontrolling interest									0	1	0
Operating segments | Delphi Technologies FIS Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									99	186	212
Restructuring									32	29	79
Separation Costs									6
Separation and transformation costs (2)										(3)	0
Asset impairments									(13)	0	(6)
Pension Cost (Reversal of Cost)									(13)
Operating income									47	154	127
Equity income, net of tax									4	7	5
Net income attributable to noncontrolling interest									0	0	0
Operating segments | Delphi Technologies PTP Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									204	256	261
Restructuring									17	6	8
Separation Costs									(1)
Separation and transformation costs (2)										(1)	1
Asset impairments									(15)	(1)	(6)
Operating income									171	248	246
Equity income, net of tax									0	0	0
Net income attributable to noncontrolling interest									16	21	34
Operating segments | Delphi Technologies E&E Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									44	126	175
Restructuring									25	0	5
Separation Costs									(16)
Separation and transformation costs (2)										(6)	(1)
Asset impairments									(2)	0	0
Operating income									1	120	169
Equity income, net of tax									0	0	0
Net income attributable to noncontrolling interest									0	0	0
Eliminations and other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted operating income									(119)	(117)	(105)	$ (105)
Restructuring									4	2		0
Separation Costs									(32)
Separation and transformation costs (2)										(63)		79
Asset impairments									(4)	0		0
Operating income									(159)	(182)	(184)	$ (184)
Equity income, net of tax									0	0
Net income attributable to noncontrolling interest									$ 0	$ 0	$ 0