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Income Taxes (Details Textuals) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Taxes (Textuals)        
U.S. statutory federal income tax rate 35.00% 35.00% 35.00%  
Aggregate of federal taxes $ 2,300,000,000      
Income taxes paid 700,000,000 800,000,000 400,000,000  
Unrecognized tax benefits 1,223,000,000 1,377,000,000 1,081,000,000 1,176,000,000
Unrecognized tax benefits as a result of potential resolutions of prior years' tax 867,000,000      
Unrecognized tax benefits, temporary differences 867,000,000      
Unrecognized tax benefits that affect effective tax rate 440,000,000 476,000,000 480,000,000  
Unrecognized tax benefits, amounts recorded to equity 640,000,000      
Unrecognized tax benefits impact not possible to quantify 227,000,000      
Unrecognized tax benefits income tax penalties and interest expense (63,000,000) 31,000,000 1,000,000  
Unrecognized tax benefits income tax penalties and interest accrued 163,000,000 226,000,000    
Tax Benefits from Discontinued Operations 36,000,000      
Income Taxes Of Non Us Subsidiaries [Line Items]        
Accumulated earnings intended to be permanently reinvested outside the U.S. $ 7,700,000,000      
Income Tax Contingency [Line Items]        
Open tax years by major tax jurisdiction 2005 through 2007