Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Income Taxes (Textual) [Abstract]
Income tax expense	$ 2		$ (3)	$ 11	$ 1	$ 9
Effective income tax rate	7.70%				1.90%
Income (loss) from continuing operations before income taxes	26			(19)	52	(109)
Federal net operating loss carryforwards	2,079				2,079
Federal alternative minimum tax credit carryforwards	45				45
Minimum taxable income needed to fully realize the U.S. federal net deferred tax assets	2,208				2,208
Foreign tax credit carryforwards	8				8
Expiration of foreign tax credit carryforwards					Jan. 01, 2015
Deferred tax assets state, net operating loss and tax credit carryforwards	269				269
Gross deferred tax assets operating loss and tax credit carry forwards that will expire in current year	1				1
Deferred tax assets, foreign operating loss and tax credit carryforwards	2				2
Valuation allowance	1,092				1,092		1,125
Additional valuation allowance against deferred tax assets recorded	13	16	4
Percentage of change in ownership					50.00%
Period of change in ownership					3 years
Long-term tax-exempt rate	3.28%				3.28%
Time period after the change in which amount of the limitation be increased or decreased by built-in gains or losses					5 years
Approximate annual NOL utilization had an ownership change occurred	102				102
Federal [Member] | Minimum [Member]
Income Taxes (Textual) [Abstract]
Expiration date of operating loss carryforwards					Jan. 01, 2026
Federal [Member] | Maximum [Member]
Income Taxes (Textual) [Abstract]
Expiration date of operating loss carryforwards					Dec. 31, 2033
State [Member] | Minimum [Member]
Income Taxes (Textual) [Abstract]
Expiration date of operating loss carryforwards					Jan. 01, 2014
State [Member] | Maximum [Member]
Income Taxes (Textual) [Abstract]
Expiration date of operating loss carryforwards					Dec. 31, 2033
Due to Change in Realizability of Deferred Tax Asset for Alternative Minimum Tax Credits [Member]
Income Taxes (Textual) [Abstract]
Additional valuation allowance against deferred tax assets recorded			3
Due to Change in Gross Value of Deferred Tax Assets [Member]
Income Taxes (Textual) [Abstract]
Additional valuation allowance against deferred tax assets recorded			$ 1