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Income Taxes (Unaudited) (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] |  |  |  |
Consolidated effective income tax rate (percent) |  |  | (5.00%) | 25.00%
U.S. operations | $ (49) | $ 829 | $ (38) | $ 1,664
International operations | (67) | (130) | (155) | (251)
Total | $ (116) | $ 699 | (193) | 1,413
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ 1,500 | $ 763
Effective Income Tax Rate, Adjusted, Percent |  |  | 33.00% | 38.00%

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