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Income Taxes (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes (Textual) [Abstract]      
Federal statutory rate 35.00% 35.00% 35.00%
Unrecognized tax positions that would impact the effective tax rate $ 220 $ 253 $ 202
Unrecognized tax positions as a component of income taxes expense, recognized in interest (2) (6) 13
Unrecognized tax positions as a component of income taxes expense, accrued interest 47    
Federal, state and foreign net operating loss carryforwards 423    
Federal, state and foreign net operating loss carryforwards, expiration date Various times through 2023    
Base year reserves included in retained earnings $ 102