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Income Taxes Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Taxes [Abstract]      
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 34.80% (103.00%)  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   35.00%  
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority     $ 98