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Income Taxes (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Consolidated effective income tax rate (percent) |  |  | (2.00%) | 18.00%
U.S. operations | $ 331 | $ 356 | $ 293 | $ 2,020
International operations | (217) | (7) | (372) | (258)
Total | $ 114 | $ 349 | (79) | 1,762
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ 1,600 | $ 2,000
Effective Income Tax Rate, Adjusted, Percent |  |  | 32.00% | 37.00%

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