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Income Taxes (Details) (USD $)
3 Months Ended6 Months Ended9 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Mar. 31, 2010
Jun. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Income Taxes (Textual) [Abstract]         
Income tax expense (benefit)$ 14,000,000  $ 2,000,000  $ 16,000,000$ 12,000,000 
Effective tax rate11.20%        
Threshold period (in years) for cumulative losses4 years        
Approximate federal net operating loss carryforwards1,800,000,000     1,800,000,000  
Federal net operating loss carryforwards, expiration dates      2026-2031  
Approximate federal alternative minimum tax credit carryforwards52,000,000     52,000,000  
Minimum taxable income needed to fully realize the U.S. federal net deferred tax assets1,900,000,000     1,900,000,000  
Foreign tax credit carryforwards6,000,000     6,000,000  
Foreign tax credit carryforwards, expiration date      2015  
Approximate gross deferred tax assets related to state NOLs and tax credit carryforwards285,000,000     285,000,000  
Approximate gross deferred tax assets operating loss and tax credit carry forwards that will expire in current year11,000,000     11,000,000  
Gross deferred tax assets related to state NOLs and tax credit carryforwards, expiration dates      2012-2031  
Approximate gross deferred tax assets related to foreign NOLs4,000,000     4,000,000  
Net increase in valuation allowance      105,000,000  
Valuation allowance against deferred tax assets989,000,000     989,000,000 884,000,000
Additional valuation allowance against deferred tax assets recorded28,000,00026,000,00054,000,000      
Increase in valuation allowance impacted by other discrete adjustments      108,000,000  
Increase in deferred tax assets valuation allowance3,000,000     3,000,000  
Ownership changes that imposes limitations on a corporation's ability to utilize NOLs      50 percentage points over a three-year period  
Long-term tax-exempt rate3.77%     3.77%  
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 occurred26,000,000     26,000,000  
Interest expense related to unrecognized tax benefits4,000,000     4,000,000  
Penalties related to unrecognized tax benefits4,000,000     4,000,000  
Recognized tax benefit due to reversal of reserves for uncertain resolved tax positions  6,000,000      
Noncash income tax benefit    19,000,0003,000,000(3,000,000)(19,000,000) 
Number of months examinations maybe be resolved12 months     12 months  
Estimated lower range for change in gross unrecognized tax benefit5,000,000     5,000,000  
Estimated upper range for change in gross unrecognized tax benefit$ 7,500,000     $ 7,500,000  
Maximum [Member]
         
Additional Income Tax (Textual) [Abstract]         
Period of limitations in Foreign and U.S. jurisdictions      5 years  
Minimum [Member]
         
Additional Income Tax (Textual) [Abstract]         
Period of limitations in Foreign and U.S. jurisdictions      3 years