Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Capitalized interest	$ 3	$ 1	$ 3
Buildings and improvements
Property, Plant and Equipment [Line Items]
Expected useful life	50 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life	10 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life	25 years
Computer software and systems development costs | Minimum
Property, Plant and Equipment [Line Items]
Expected useful life	5 years
Computer software and systems development costs | Maximum
Property, Plant and Equipment [Line Items]
Expected useful life	7 years