Significant Accounting Policies (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 04, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Return assets		$ 8		$ 8		$ 0
Separation Date	Dec. 04, 2017
Weighted Average Number of Shares Outstanding, Basic	88,610,000	88,780,000	88,610,000	88,750,000	88,610,000
Operating Leases, Future Minimum Payments Due						85
Intangible assets, net (Excluding Goodwill)		$ 70		$ 70		75
Goodwill		7		7		7
Components of net periodic benefit cost other than service cost		2	$ 4	3	$ 7
Cost of technology investments				7	0
Amortization of Intangible Assets		$ 2	$ 4	6	$ 8
PolyCharge [Member]
Significant Accounting Policies [Line Items]
Cost of technology investments				$ 7		$ 1	$ 20
Delphi - TVS Diesel Systems Ltd [Member]
Significant Accounting Policies [Line Items]
Equity Method Investment, Ownership Percentage		50.00%		50.00%