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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Tax Disclosure [Abstract]        
Effective tax rate (203.00%) 7.00% (20.00%) 6.00%
Total pretax special items impacting adjusted effective tax rate     $ 494  
Adjusted effective tax rate 8.00%   6.00%  
Expected reduction, over next 12 months, in uncertain tax position related to an international tax settlement $ 43   $ 43