Description of Business and Summary of Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Asset retirement liability (less than)	$ 2	$ 1
Minimum \| Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	5 years
Minimum \| Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	5 years
Minimum \| Computer and data processing equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	3 years
Minimum \| Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	3 years
Minimum \| Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	5 years
Maximum \| Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	10 years
Maximum \| Building and leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	25 years
Maximum \| Computer and data processing equipment
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	5 years
Maximum \| Computer software
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	5 years
Maximum \| Furniture and fixtures
Property, Plant and Equipment [Line Items]
Estimated useful life of property, plant and equipment	10 years