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Debt (2013 Credit Facility - Narrative) (Details) - Long-term Debt [Member] - USD ($)
9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2013
2013 Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 66,000,000 $ 2,000,000,000
Credit facility, maturity date Dec. 01, 2018    
Amount outstanding $ 0    
Debt percentage of adjusted book capital structure covenant 60.00%    
2016 Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   743,000,000  
Term Loan due December 2020 [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 1,191,000,000