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Long-Term Debt (5.125% Senior Notes, Due 2021 Narrative) (Details) - Senior Secured Notes [Member] - Senior Secured Notes at 5.125, Due 2021 [Member] - USD ($)
1 Months Ended 12 Months Ended
Jan. 27, 2014
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt instrument, offering date   Jan. 27, 2014
Debt Instrument, Face Amount $ 1,000,000,000  
Debt Instrument, Interest Rate, Stated Percentage 5.125%  
Debt Instrument, Redemption, Period Two [Member]    
Debt Instrument [Line Items]    
Minimum Period Notice for Redemption of Debt 30 days  
Maximum Period Notice for Redemption of Debt 60 days