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Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current income tax expense: |  |  |
United States federal | $ 836 | $ 94 | $ 78
United States state and local | 38 | 50 | 23
International | 133 | 176 | 108
Total current income tax expense | 1,007 | 320 | 209
Deferred income tax expense (benefit): |  |  |
United States federal | 84 | (17) | 2
United States state and local | (9) | (12) | 8
International | (39) | (17) | 77
Total deferred income tax expense (benefit) | 36 | (46) | 87
Total income tax expense | $ 1,043 | $ 274 | $ 296

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