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Income Taxes (Schedule of Effective Tax Rate) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount $ 9      
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit 7      
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) Net $ 4      
Unrecognized Tax Benefits, Period Increase (Decrease)     $ 2  
Effective income tax rate 12.00% 20.00% 16.00% 19.00%