Restructuring Restructuring Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Document Period End Date	Mar. 31, 2020
Restructuring	$ (43)	$ (3)	$ (3)
Delphi Technologies FIS Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	(32)		(3)
Delphi Technologies PTP Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	(8)		0
Delphi Technologies E&E Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	(1)		0
Aftermarket Segment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	0		0
Intersegment Eliminations [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	$ (2)		$ 0