Acquisitions And Divestitures Acquisition of PureDepth, Inc. (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 23, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Purchase price, cash consideration, net of cash acquired		$ 324	$ 15	$ 1,654
Goodwill		$ 1,944	$ 1,502	$ 1,531
PureDepth, Inc.
Business Acquisition [Line Items]
Business Acquisition, Percentage of Equity Interests Acquired	100.00%
Purchase price, cash consideration, net of cash acquired	$ 15
Intangible assets	10
Goodwill	5
Total purchase price allocation	$ 15