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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