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Long-Term Debt (8.0% Senior Notes, Due 2019) (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jun. 22, 2018
Jul. 18, 2012
Mar. 21, 2012
Nov. 22, 2011
Sep. 30, 2019
Dec. 31, 2011
Dec. 31, 2018
Debt Instrument [Line Items]              
Long-term debt outstanding         $ 13,604,000,000   $ 13,596,000,000
Senior Notes at 8.875, Due 2015 [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Extinguishment of debt amount   $ 934,000,000 $ 850,000,000     $ 1,000,000,000  
Senior Notes at 8.0, Due 2019 [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, offering date         Nov. 22, 2011    
Debt instrument aggregate principal amount       $ 1,000,000,000      
Debt instrument, maturity date         Nov. 15, 2019    
Long-term debt outstanding $ 155,000,000       $ 155,000,000   155,000,000
Debt instrument stated interest rate 8.00%   8.00% 8.00%      
Senior Notes at 8.0, Due 2019, March 21, 2012 Secondary Offering [Member]              
Debt Instrument [Line Items]              
Debt instrument stated interest rate     8.00%        
Senior Notes at 8.0, Due 2019, March 21, 2012 Secondary Offering [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, offering date         Mar. 21, 2012    
Debt instrument aggregate principal amount     $ 1,000,000,000        
Debt instrument prepium percentage     102.50%        
Junior-Priority Secured Notes Due 2023 [Member] | Junior-Priority Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, offering date         Jun. 22, 2018    
Debt instrument aggregate principal amount $ 1,770,000,000            
Long-term debt outstanding         $ 1,770,000,000   $ 1,770,000,000
Debt Instrument, Redemption, Period Two [Member]              
Debt Instrument [Line Items]              
Minimum period notice for redemption of debt 15 days            
Maximum period notice for redemption of debt 60 days            
Debt Instrument, Redemption, Period Two [Member] | Senior Notes at 8.0, Due 2019 [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Minimum period notice for redemption of debt       30 days      
Maximum period notice for redemption of debt       60 days