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Long-Term Debt And Borrowing Arrangements (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Document Period End Date   Jun. 30, 2016  
Other Long-term Debt $ 59 $ 59 $ 46
Deferred Finance Costs, Net (53) (53) (55)
Long-term Debt $ 3,530 $ 3,530 3,461
Uncommitted Credit Facility [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.02%    
Uncommitted Credit Facility [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 4.50%    
Six And Three Over Eight Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   April 2024  
Long-term Debt, Gross $ 350 $ 350 0
Six And Three Over Eight Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 350 $ 350  
Floating Rate Term Loan Due March Two Thousand Nineteen [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   March 2019  
Long-term Debt, Gross $ 144 $ 144 970
Debt Instrument, Description of Variable Rate Basis 225 basis points    
Five and One over Eight Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   June 2022  
Long-term Debt, Gross $ 400 $ 400 400
Five And One Over Two Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   April 2023  
Long-term Debt, Gross 674 $ 674 674
Four And Seven Over Eight Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   November 2017  
Long-term Debt, Gross 0 $ 0 300
Four And Seven Over Eight Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross 300 300  
Repayments of Debt   $ 304  
Floating Rate Term Loan Due March Two Thousand Twenty Two [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   March 2022  
Long-term Debt, Gross $ 820 $ 820 $ 0
Debt Instrument, Description of Variable Rate Basis 250 basis points    
Debt Instrument, Face Amount $ 825 $ 825  
Debt Instrument, Basis Spread on Variable Rate 4.21% 2.50%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 0.75% 0.75%