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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax (benefit) expense $ (56) $ 90 $ 3 $ 99
Effective income tax rate reconciliation, at federal statutory income tax rate, percent 35.00% 35.00% 35.00% 35.00%