Summary of Significant Accounting Policies Property Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Foreign cash and investments	$ 98	$ 166
Unearned compensation cost, expected to be recognized over period (years)	2 years 3 months 25 days
Property, plant and equipment, gross	$ 598	554
Less accumulated depreciation	(306)	(256)
Property, plant and equipment, net	292	298
Depreciation	75	69	$ 27
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51	50
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10	10
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	226	195
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15	20
Computers And Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	197	180
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	64	63
Construction in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 35	$ 36
Maximum
Property, Plant and Equipment [Line Items]
Unearned compensation cost, expected to be recognized over period (years)	4 years