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Long-Term Debt (7.125% Senior Notes, Due 2020) (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 22, 2018
Jul. 18, 2012
Mar. 21, 2012
Mar. 31, 2019
Dec. 31, 2011
Dec. 31, 2018
Debt Instrument [Line Items]            
Long-term debt outstanding       $ 13,590,000,000   $ 13,596,000,000
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     $ 121,000,000   121,000,000
Extinguishment of debt amount 1,079,000,000          
Debt instrument stated interest rate   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 aggregate principal amount $ 1,355,000,000          
Long-term debt outstanding       $ 1,355,000,000   $ 1,355,000,000
Debt instrument stated interest rate 8.175%          
Junior Priority Secured Notes One [Member] | Junior-Priority Secured Notes Due 2024 [Member]            
Debt Instrument [Line Items]            
Debt instrument aggregate principal amount $ 1,079,000,000          
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 [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] | Junior-Priority Secured Notes [Member] | Junior-Priority Secured Notes Due 2024 [Member]            
Debt Instrument [Line Items]            
Minimum period notice for redemption of debt       15 days    
Maximum period notice for redemption of debt       60 days