Intangible Assets and Goodwill (Fair Value of Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Feb. 19, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		$ 728	$ 420	$ 383
Guardian Digital Communications Limited (GDCL)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Cash	$ 86
Accounts receivable, net	55
Other current assets	36
Property, plant and equipment, net	245
Deferred income taxes	82
Accounts payable	(18)
Accrued liabilities	(181)
Other liabilities	(289)
Goodwill	191
Intangible assets	875
Total consideration	1,082
Net present value of deferred consideration payment to former owners	(82)
Net cash consideration at purchase	$ 1,000