Shareholders' Equity And Net Income Per Share Weighted Average Shares Outstanding and Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Dec. 04, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to Delphi Technologies		$ 86	$ 48	$ 184	$ 151
Weighted Average Number of Shares Outstanding, Basic	88,610,000	88,780,000	88,610,000	88,750,000	88,610,000
Denominator:
Dilutive shares related to restricted stock units		270,000	0	230,000	0
Weighted Average Number of Shares Outstanding, Diluted		89,050,000	88,610,000	88,980,000	88,610,000
Basic net income per share:
Basic (in dollars per share)		$ 0.97	$ 0.54	$ 2.07	$ 1.70
Diluted net income per share:
Diluted (in dollars per share)		$ 0.97	$ 0.54	$ 2.07	$ 1.70
Antidilutive securities share impact		0.00	0.00		0.00