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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
Jan. 27, 2014
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt instrument, offering date     Jan. 27, 2014
Debt instrument aggregate principal amount $ 1,000,000,000 $ 1,000,000,000  
Debt instrument stated interest rate 5.125% 5.125%  
Debt instrument redemption price percentage 100.00%    
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