Additional Information (Schedule of Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Research and development expense	$ 186	$ 167	$ 153
Advertising expense	25	30	7
Interest expense	808	857	1,053
Interest income	(4)	(2)	(4)
Interest related to NPM adjustment items	13	(47)	0
Interest expense (income), net	817	808	1,049
Rent expense	$ 48	$ 52	$ 49