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Long-Term Debt (8.0% Senior Notes, Due 2019) (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jun. 22, 2018
Jul. 18, 2012
Mar. 21, 2012
Nov. 22, 2011
Dec. 31, 2018
Dec. 31, 2011
Dec. 31, 2017
Debt Instrument [Line Items]              
Long-term debt outstanding         $ 13,596,000,000    
Debt         $ 13,596,000,000   $ 13,913,000,000
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]              
Debt Instrument [Line Items]              
Long-term debt outstanding $ 155,000,000            
Senior Notes at 8.0, Due 2019 [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt instrument, offering date         Nov. 22, 2011    
Debt Instrument, Maturity Date         Nov. 15, 2019    
Debt Instrument, Face Amount       $ 1,000,000,000      
Debt Instrument, Interest Rate, Stated Percentage     8.00% 8.00%      
Debt         $ 155,000,000   $ 1,925,000,000
Senior Notes at 8.0, Due 2019, March 21, 2012 Secondary Offering [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage     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, Face Amount     $ 1,000,000,000        
Debt Instrument, Premium Percentage     102.50%        
Junior-Priority Secured Notes due 2023 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount 1,770,000,000            
Debt         $ 1,770,000,000    
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, Face Amount $ 1,770,000,000            
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      
Debt Instrument, Redemption, Period Two [Member] | Junior-Priority Secured Notes due 2023 [Member] | Junior-Priority Secured Notes [Member]              
Debt Instrument [Line Items]              
Minimum Period Notice for Redemption of Debt 15 days            
Maximum Period Notice for Redemption of Debt 60 days