Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenue		$ 233	$ 689
Income (loss) from operations of discontinued businesses, before income tax		50	(3)
Income tax expense	$ 0	(23)	(24)
Income (loss) from operations of discontinued businesses, after income tax	0	27	(27)
Net loss from disposal and impairments of discontinued businesses, after income tax	$ 0	$ (56)	$ (152)