Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]
Revenues	$ 0			$ 154
Income from operations	0			5
Gain (loss) on disposal	2	(2)	(23)	0	(25)
Net Income Before Income Taxes	2			5
Income tax expense	0			(2)
Income From Discontinued Operations, Net of Tax	$ 2			$ 3