Segment and Geographic Data (Summary of Revenue and Property, Plant and Equipment by Geographical Location) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,373	$ 1,220	$ 1,160	$ 1,123	$ 1,371	$ 1,296	$ 1,345	$ 1,237	$ 4,876	$ 5,249	$ 5,207
Property, plant and equipment	657				658				657	658	656
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									2,297	2,554	2,424
Property, plant and equipment	253				274				253	274	281
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,407	1,380	1,449
Property, plant and equipment	277				249				277	249	250
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									618	659	660
Property, plant and equipment	64				67				64	67	66
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									554	656	674
Property, plant and equipment	$ 63				$ 68				$ 63	$ 68	$ 59