Segment Reporting Reconciliation of Adjusted OI to Net Income (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	$ 40	$ 87
Restructuring Charges	(43)	(3)	$ (3)
Separation Costs	(3)	(18)
Asset impairments	(12)	(3)
Pension Cost (Reversal of Cost)	(2)	(8)
Operating (Loss) income	(20)	55
Interest expense	(16)	(18)
Other income (expense), net	2	(12)
(Loss) income before income taxes and equity income	(34)	25
Income tax expense	(20)	(8)
Equity income, net of tax	0	2
Net (loss) income	(54)	19
Net income attributable to noncontrolling interest	3	3
Net (loss) income attributable to Delphi Technologies	(57)	16
Delphi Technologies FIS Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Restructuring Charges	(32)		(3)
Delphi Technologies PTP Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Restructuring Charges	(8)		0
Delphi Technologies E&E Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Restructuring Charges	(1)		0
Aftermarket Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Restructuring Charges	0		$ 0
Operating Segments | Delphi Technologies FIS Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	18	23
Restructuring Charges	(32)	(3)
Separation Costs	0	0
Asset impairments	0	0
Pension Cost (Reversal of Cost)	(2)	(7)
Operating (Loss) income	(16)	13
Equity income, net of tax	0	2
Net income attributable to noncontrolling interest	1	0
Operating Segments | Delphi Technologies PTP Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	35	61
Restructuring Charges	(8)	0
Separation Costs	0	(1)
Asset impairments	0	(3)
Operating (Loss) income	27	57
Equity income, net of tax	0	0
Net income attributable to noncontrolling interest	2	3
Operating Segments | Delphi Technologies E&E Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	1	17
Restructuring Charges	(1)	0
Separation Costs	(2)	(4)
Asset impairments	0	0
Operating (Loss) income	(2)	13
Equity income, net of tax	0	0
Net income attributable to noncontrolling interest	0	0
Operating Segments | Aftermarket Segment [Member]
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	15	15
Restructuring Charges	0	0
Separation Costs	0	0
Asset impairments	0	0
Pension Cost (Reversal of Cost)	0	(1)
Operating (Loss) income	15	14
Equity income, net of tax	0	0
Net income attributable to noncontrolling interest	0	0
Intersegment Eliminations
Reconciliation of Segment Adjusted OI to Consolidated Net Income
Adjusted Operating Income (Loss)	(29)	(29)
Restructuring Charges	(2)	0
Separation Costs	(1)	(13)
Asset impairments	(12)	0
Operating (Loss) income	(44)	(42)
Equity income, net of tax	0	0
Net income attributable to noncontrolling interest	$ 0	$ 0