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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 577 $ (254) $ 1,106 $ (478)
Tax expense (benefit), entities included in effective tax rate calculation 793   1,300  
Deferred Tax Assets, Net $ 33,400   $ 33,400