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Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Federal: |  |  |
Current | $ 0 | $ 2 | $ 9
Deferred | 545 | (361) | (63)
State: |  |  |
Current | 0 | 1 | 1
Deferred | 1 | (4) | (5)
Foreign: |  |  |
Current | 335 | 318 | 470
Deferred | 109 | 76 | 0
Total | $ 990 | $ 32 | $ 412

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