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Income Taxes Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate 9.20%   12.70%
Tax Adjustments, Settlements, and Unusual Provisions $ 101    
Non-US [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred Foreign Income Tax Expense/(Benefit) Expected   $ 235