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Debt Obligations Senior Secured Credit Facility (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Long-term Debt $ 3,014  
Long-term debt 2,939 $ 3,001
Letters of Credit Outstanding, Amount $ 0  
Debt Instrument Covenant Maximum Consolidated Leverage Ratio 4.35  
Available Additional Amount of Incremental Term Loan or Incremental Revolving Commitment $ 150  
Period One [Member]    
Debt Instrument [Line Items]    
Debt Instrument Covenant Consolidated Leverage Ratio 4.25  
Debt Instrument, Covenant, Maximum Spread on Consolidated Leverage Ratio 0.50  
Debt Instrument Covenant Interest Coverage Ratio 3.5  
Period Two [Member]    
Debt Instrument [Line Items]    
Debt Instrument Covenant Consolidated Leverage Ratio 4.00  
Period Three [Member]    
Debt Instrument [Line Items]    
Debt Instrument Covenant Consolidated Leverage Ratio 3.75  
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 810  
Long-term debt [1] 759 $ 821
Secured Debt [Member] | Revolving [Member]    
Debt Instrument [Line Items]    
Secured Credit Facility Maximum Borrowing Amount 1,100  
Secured Debt [Member] | Revolving Foreign [Member]    
Debt Instrument [Line Items]    
Secured Credit Facility Maximum Borrowing Amount $ 400  
Federal Funds Rate [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
Base Rate [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Margin for Base Rate Loans 2.25%  
Maximum [Member] | EURIBOR [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Margin for Base Rate Loans 1.25%  
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Margin for Base Rate Loans 1.25%  
Minimum [Member] | EURIBOR [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Margin for Base Rate Loans 0.25%  
Quarterly installments beginning September 30, 2016 [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Periodic Payment $ 11  
Quarterly installments beginning September 30, 2018 [Domain] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Periodic Payment 17  
Quarterly installments beginning September 30, 2017 [Member] [Member] | Secured Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Periodic Payment $ 23  
[1] Interest rates are weighted average interest rates as of December 31, 2017 and 2016.