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Long-Term Debt (7.125% Senior Notes, Due 2020) (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 22, 2018
Jul. 18, 2012
Mar. 21, 2012
Dec. 31, 2018
Dec. 31, 2011
Debt Instrument [Line Items]          
Long-term debt outstanding       $ 13,596,000,000  
Junior-Priority Secured Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 276,000,000        
Senior Notes [Member] | Senior Notes at 8.875, Due 2015 [Member]          
Debt Instrument [Line Items]          
Extinguishment of Debt, Amount   $ 934,000,000 $ 850,000,000   $ 1,000,000,000
Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Jul. 18, 2012  
Long-term debt outstanding 121,000,000        
Extinguishment of Debt, Amount $ 1,079,000,000        
Debt Instrument, Interest Rate, Stated Percentage   7.125%      
Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Jun. 22, 2018  
Debt Instrument, Interest Rate, Stated Percentage 8.175%        
Minimum Period Notice for Redemption of Debt 15 days        
Maximum Period Notice for Redemption of Debt 60 days        
Junior Priority Secured Notes One [Member] | Junior-Priority Secured Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 1,079,000,000        
Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]          
Debt Instrument [Line Items]          
Minimum Period Notice for Redemption of Debt   30 days      
Maximum Period Notice for Redemption of Debt   60 days