Additional Information (Schedule of Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Research and development expense	$ 203	$ 186	$ 167
Advertising expense	27	25	30
Interest expense	754	808	857
Interest income	(13)	(4)	(2)
Interest related to NPM adjustment items	6	13	(47)
Interest and other debt expense, net	747	817	808
Rent expense	$ 53	$ 48	$ 52