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Long-Term Debt (Junior-Priority Secured Notes due 2024 Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 22, 2018
Jan. 27, 2014
Jul. 18, 2012
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Issuance of long-term debt       $ 1,033,000,000 $ 3,100,000,000
Junior-Priority Secured Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 276,000,000        
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%        
Debt Instrument, Redemption, Description       plus a "make-whole" premium, as described in the indenture governing the 2024 Junior-Priority Notes.  
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        
Junior Priority Secured Notes Two [Member] | Junior-Priority Secured Notes due 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 1,355,000,000        
Senior Notes [Member] | Senior Notes at 7.125, Due 2020 [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Jul. 18, 2012  
Extinguishment of Debt, Amount 1,079,000,000        
Debt Instrument, Interest Rate, Stated Percentage     7.125%    
Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]          
Debt Instrument [Line Items]          
Debt instrument, offering date       Jan. 27, 2014  
Debt Instrument, Face Amount   $ 3,000,000,000      
Extinguishment of Debt, Amount $ 368,000,000        
Debt Instrument, Interest Rate, Stated Percentage   6.875%      
Debt Instrument, Redemption, Period One [Member] | Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes due 2024 [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 due 2024 [Member]          
Debt Instrument [Line Items]          
Maximum Principal Redeemable Using Proceeds from a Public Equity Offering, as a Percentage of Principal Amount 40.00%        
Debt Instrument Redemption Price Percentage 108.125%        
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    
Debt Instrument, Redemption, Period Two [Member] | Senior Notes [Member] | Senior Notes at 6.875, Due 2022 [Member]          
Debt Instrument [Line Items]          
Minimum Period Notice for Redemption of Debt   30 days      
Maximum Period Notice for Redemption of Debt   60 days