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Long-Term Debt (6.25% Senior Secured Notes, Due 2023 Narrative) (Details) - USD ($)
12 Months Ended
May 12, 2017
May 04, 2017
Mar. 16, 2017
Dec. 30, 2016
Apr. 29, 2016
Dec. 31, 2017
Mar. 09, 2015
Aug. 17, 2012
Debt Instrument [Line Items]                
Issuance of long-term debt           $ 3,100,000,000    
Senior Secured Notes [Member] | Senior Secured Notes at 6.25, Due 2023 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount $ 3,100,000,000   $ 2,200,000,000          
Issuance of long-term debt 900,000,000              
Debt Instrument, Interest Rate, Stated Percentage     6.25%          
Senior Secured Notes [Member] | Senior Secured Notes At 5.125 Due 2018 [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Offering Date           Aug. 17, 2012    
Extinguishment of Debt, Amount           $ 700,000,000    
Debt Instrument, Interest Rate, Stated Percentage               5.125%
Secured Debt [Member] | Credit Facility, Term Loan F [Member]                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount             $ 1,700,000,000  
Extinguishment of Debt, Amount     $ 1,445,000,000 $ 48,000,000 $ 190,000,000      
Secured Debt [Member] | Credit Facility, Term Loan A [Member]                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount $ 713,000,000 $ 39,000,000   $ 26,000,000        
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]                
Max Principal Redeemable Using Proceeds from a Public Equity Offering, as a Percentage of Principal Amount     40.00%          
Debt Instrument Redemption Price Percentage     106.25%