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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]      
Income taxes paid, net $ 304,000,000 $ (6,000,000) $ 17,000,000
Income tax loss carryforwards 1,800,000,000    
Losses on acquisition 73,000,000    
Total losses 1,000,000,000    
Expiry date of losses Between 2012 and 2031    
Valuation allowances released (78,000,000) (3,000,000)  
Remaining valuation allowances 80,000,000    
Gross unrecognized tax benefits 252,000,000 257,000,000 243,000,000
Recognized tax benefits 222,000,000 186,000,000  
Interest and penalties, on the unrecognized tax benefits 42,000,000 45,000,000  
Reserves for interest and penalties 3,000,000    
Decrease in gross unrecognized tax benefit 93,000,000    
Decrease in recognized tax benefits $ 84,000,000