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Long-Term Debt (6.25% Senior Secured Notes, Due 2023 Narrative) (Details) - USD ($)
12 Months Ended
May 12, 2017
Mar. 16, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Issuance of long-term debt     $ 1,033,000,000 $ 3,100,000,000
Senior Secured Notes [Member] | Senior Secured Notes at 6.25, Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument, offering date     Mar. 16, 2017  
Debt Instrument, Face Amount $ 3,100,000,000 $ 2,200,000,000    
Issuance of long-term debt 900,000,000      
Debt instrument stated interest rate   6.25%    
Senior Secured Notes [Member] | 2018 Senior Secured Notes [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt amount     $ 700,000,000  
Secured Debt [Member] | Credit Facility, Term Loan F [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt amount   $ 1,445,000,000    
Secured Debt [Member] | Credit Facility, Term Loan A [Member]        
Debt Instrument [Line Items]        
Extinguishment of debt amount $ 713,000,000      
Debt Instrument, Redemption, Period One [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 6.25, Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt instrument redemption price percentage   100.00%    
Debt instrument redemption description     plus a "make-whole" premium, as described in the indenture governing the 6¼% Senior Secured Notes.  
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 Secured Notes [Member] | Senior Secured Notes at 6.25, Due 2023 [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   106.25%