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Income Taxes (Narrative - Carryforwards and Valuation Adjustment) (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Loss Carryforwards [Line Items]                      
Income tax expense (benefit) from continuing operations $ (887,000,000) $ 46,000,000 $ (16,000,000) $ 1,000,000 $ 14,000,000 $ 10,000,000 $ 8,000,000 $ 10,000,000 $ (856,000,000) $ 42,000,000 $ 97,000,000
Deferred Tax Assets, Valuation Allowance 1,653,000,000       2,274,000,000       1,653,000,000 2,274,000,000  
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 1,600,000,000               1,600,000,000    
Domestic Tax Authority [Member]
                     
Operating Loss Carryforwards [Line Items]                      
Deferred Tax Assets, Valuation Allowance 1,600,000,000               1,600,000,000    
Operating Loss Carryforwards 668,000,000               668,000,000    
Deferred Tax Assets, Capital Loss Carryforwards 2,200,000,000               2,200,000,000    
State and Local Jurisdiction [Member]
                     
Operating Loss Carryforwards [Line Items]                      
Operating Loss Carryforwards 1,700,000,000               1,700,000,000    
Deferred Tax Assets, Capital Loss Carryforwards $ 3,100,000,000               $ 3,100,000,000