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Long-Term Debt (Junior-Priority Secured Notes At 9.875% due 2023 Narrative) (Details) - USD ($)
12 Months Ended
Jun. 22, 2018
Dec. 31, 2019
Mar. 21, 2012
Nov. 22, 2011
Junior-Priority Secured Notes At 9.875% Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument aggregate principal amount $ 1,770,000,000      
Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes At 9.875% Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument, offering date   Jun. 22, 2018    
Debt instrument aggregate principal amount $ 1,770,000,000      
Debt instrument stated interest rate 11.00%      
Debt instrument redemption description   plus a "make-whole" premium, as described in the indenture governing the 9⅞% Junior-Priority Secured Notes due 2023.    
Senior Notes [Member] | Senior Notes at 8.0%, Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, offering date   Nov. 22, 2011    
Debt instrument aggregate principal amount       $ 1,000,000,000
Debt instrument stated interest rate     8.00% 8.00%
Debt Instrument, Redemption, Period One [Member] | Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes At 9.875% Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage 100.00%      
Debt Instrument, Redemption, Period Two [Member] | Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes At 9.875% Due 2023 [Member]        
Debt Instrument [Line Items]        
Minimum period notice for redemption of debt 15 days      
Maximum period notice for redemption of debt 60 days