Income Taxes (Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income tax expense (benefit) from continuing operations	$ 28	$ 46	$ (55)	$ 31
Valuation Allowance, Deferred Tax Asset, Change in Amount			298
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 66		$ 66