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Income Taxes (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Income Tax Disclosure [Abstract] |  |
Consolidated effective income tax rate (percent) | (2.00%) | 23.00%
U.S. operations | $ 11 | $ 835
International operations | (88) | (121)
Total | (77) | 714
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 1,400 | $ 458
Effective Income Tax Rate, Adjusted, Percent | 34.00% | 37.00%

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