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Long-Term Debt And Borrowing Arrangements (Narrative) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Document Period End Date   Jun. 30, 2018  
Other Long-term Debt $ 43 $ 43 $ 49
Uncommitted Credit Facility [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 0.74%    
Uncommitted Credit Facility [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Interest Rate During Period 1.54%    
Four and One over Two Euro-Denominated Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   May 2025  
Long-term Debt, Gross $ 292 $ 292 300
Six And Three Over Eight Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   April 2024  
Long-term Debt, Gross 350 $ 350 350
Five and One over Eight Senior Notes [Member] | 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] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   April 2023  
Long-term Debt, Gross 675 $ 675 675
Floating Rate Term Loan Due March Two Thousand Twenty Two [Member] | Loans Payable [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   March 2022  
Long-term Debt, Gross 0 $ 0 1,136
Four and One over Eight Euro-Denominated Senior Notes [Member] | Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date, Description   November 2024  
Long-term Debt, Gross $ 351 $ 351 $ 360