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Income Taxes (Analysis of the Provision for Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
United States | $ 463 | $ 523 | $ 223
State | 52 | 53 | 56
Other countries | 330 | 361 | 394
Total | 845 | 937 | 673
United States | (68) | (40) | (180)
State | (3) | 31 | (74)
Other countries | 2 | (6) | (1)
Total | (69) | (15) | (255)
Total provision for income taxes | $ 776 | $ 922 | $ 418

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