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Long-Term Debt (Credit Facility Terms Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 23, 2018
USD ($)
Feb. 26, 2018
USD ($)
Mar. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Debt Instrument [Line Items]        
Ratio of first lien net debt to EBITDA     4.47  
Maximum [Member]        
Debt Instrument [Line Items]        
Ratio of first lien net debt to EBITDA     5.25  
Credit Facility, Name [Member] | Credit Facility, Type of Debt [Member]        
Debt Instrument [Line Items]        
Aggregate Principal Amount of Each Tranche Available in Future     $ 1,500,000,000  
Minimum Number of Tranches Available in Future | item     1  
Debt, Weighted Average Interest Rate     5.60%  
Credit Facility, Name [Member] | Credit Facility, Type of Debt, Amendment [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 650,000,000    
First Lien net Debt to Current Earnings   5.25    
First Lien net Debt to Current Earnings in Period One   5.0    
First Lien net Debt to Current Earnings in Period Two   4.75    
First Lien net Debt to Current Earnings in Period Three   4.5    
First Lien net Debt to Current Earnings in Period Four   4.25    
Percentage of Net Cash Proceeds of Asset Sales Applied to Prepay Term Loans, Tier 1   100.00%    
Percentage of Net Cash Proceeds of Asset Sales Applied to Prepay Term Loans, Tier 2   50.00%    
Percentage of Net Cash Proceeds of Asset Sales Applied to Prepay Term Loans, Tier 3   0.00%    
Credit Facility, Name [Member] | Credit Facility, Type of Debt, Amendment [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
First Lien net Debt to Current Earnings, Tier 1   4.5    
First Lien net Debt to Current Earnings, Tier 2   4.0    
Credit Facility, Name [Member] | Credit Facility, Type of Debt, Amendment [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
First Lien net Debt to Current Earnings, Tier 2   4.5    
First Lien net Debt to Current Earnings, Tier 3   4.0    
Credit Facility, Name [Member] | Credit Facility, Type of Debt, Amendment No. 2 [Member]        
Debt Instrument [Line Items]        
Aggregate Principal Amount of Each Tranche Available in Future     $ 1,000,000,000  
Credit Facility, Name [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000,000      
Credit Facility, Revolving Credit Loans [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.50%  
Letters of Credit Outstanding, Amount     $ 57,000,000  
Line of Credit Facility, Remaining Borrowing Capacity     $ 650,000,000  
Line of Credit Facility, Maximum Borrowing Capacity       $ 929,000,000
Credit Facility, Revolving Credit Loans [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Effective Aggregate Principal Amount of Each Tranche Available in Future 500,000,000      
Line of Credit Facility, Maximum Borrowing Capacity $ 425,000,000      
Credit Facility, Revolving Credit Loans, January 27, 2021 [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 739,000,000
Credit Facility, Term Loans [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Equivalent Percentage of Term Loan Facility Related to Net Cash Proceeds of Certain Asset Sales and Dispositions by Company and Its Subsidiaries     100.00%  
Equivalent Percentage of Term Loan Facility Related to Net Cash Proceeds of Issuance of Certain Debt Obligations or Receivables Based Financing by Company and Its Subsidiaries     100.00%  
Equivalent Percentage of Term Loan Facility Subject to Reduction to Lower Percentage Based on Company Leverage Ratio     75.00%  
Credit Facility, Term Loan G [Member]        
Debt Instrument [Line Items]        
Number of additional amortization payments required | item       0
Credit Facility, Term Loan F, Term Loan G or Term Loan H [Member | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Paydown Percentage of Original Principal     1.00%  
Credit Facility, Revolving Credit Loans, Extended and Non-Extended [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity   $ 840,000,000    
Alternate Base Rate [Member] | Credit Facility, Term Loan A [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.50%  
Alternate Base Rate [Member] | Credit Facility, Term Loan G [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.75%  
Alternate Base Rate [Member] | Credit Facility, Term Loan G [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.00%      
Alternate Base Rate [Member] | Credit Facility, Term Loan H [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     2.00%  
Alternate Base Rate [Member] | Credit Facility, Term Loan H [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 2.25%      
Alternate Base Rate [Member] | Credit Facility, Term Loan G and Term Loan H [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate     2.00%  
Federal Funds Effective Rate [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     0.50%  
LIBOR [Member] | Credit Facility, Revolving Credit Loans [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     2.50%  
LIBOR [Member] | Credit Facility, Revolving Credit Loans [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     1.00%  
LIBOR [Member] | Credit Facility, Term Loan G [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     2.75%  
LIBOR [Member] | Credit Facility, Term Loan G [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.00%      
LIBOR [Member] | Credit Facility, Term Loan H [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate     3.00%  
LIBOR [Member] | Credit Facility, Term Loan H [Member] | Credit Facility, Type of Debt, Fourth Amendment and Restatement [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate 3.25%      
LIBOR [Member] | Credit Facility, Term Loan G and Term Loan H [Member] | Secured Debt [Member]        
Debt Instrument [Line Items]        
Derivative, Floor Interest Rate     1.00%