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U.S. Tax Reform U.S. Tax Reform (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
U.S. Tax Reform Related Matters |  |
U.S. Federal Statutory Income Tax Rate | 21.00% | 35.00%
U.S. Tax Cuts and Job Act |  |
U.S. Tax Reform Related Matters |  |
Other Tax Expense (Benefit) | $ 82 |

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