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Income Taxes (Provision for Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current tax: |  |  |
U.S. federal | $ 0 | $ (1) | $ 6
State and foreign | 154 | 171 | 147
Current tax, total | 154 | 170 | 153
Deferred tax: |  |  |
U.S. federal | 217 | 19 | 12
State and foreign | 30 | (3) | 13
Deferred tax, total | 247 | 16 | 25
Total | $ 401 | $ 186 | $ 178

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