Consolidated Statements of Operations (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Income from operations of discontinued businesses, income tax expense (benefit)	$ 24	$ 26	$ (48)
Gain (loss) from disposal and impairment of discontinued businesses, income tax expense (benefit)	$ (15)	$ 68	$ 300