Discontinued Operations and Held-For-Sale Businesses (Schedule of Disposal Groups, Including Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations and Disposal Groups [Abstract]
Revenue	$ 689	$ 1,043	$ 1,661
Income (loss) from operations of discontinued businesses, before income tax	(3)	73	(206)
Income tax benefit (expense)	(24)	(26)	48
Income (loss) from operations of discontinued businesses, after income tax	(27)	47	(158)
Net gain (loss) from disposal and impairments of discontinued businesses, after income tax	$ (152)	$ 16	$ 86