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Long-Term Debt (5.125% Senior Notes, Due 2021 Narrative) (Details) - USD ($)
1 Months Ended 6 Months Ended
Jun. 22, 2018
Jan. 27, 2014
Jun. 30, 2019
Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]      
Debt Instrument [Line Items]      
Debt instrument, offering date     Jan. 27, 2014
Debt instrument aggregate principal amount   $ 1,000,000,000  
Debt instrument stated interest rate   5.125%  
Debt Instrument, Redemption, Period Two [Member]      
Debt Instrument [Line Items]      
Minimum period notice for redemption of debt 15 days    
Maximum period notice for redemption of debt 60 days    
Debt Instrument, Redemption, Period Two [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 5.125, Due 2021 [Member]      
Debt Instrument [Line Items]      
Minimum period notice for redemption of debt   30 days  
Maximum period notice for redemption of debt   60 days