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Debt - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Lease_Agreement
Swap
Dec. 31, 2013
USD ($)
Debt Instrument [Line Items]      
(Gain) loss on debt extinguishment, net   $ 1,000,000 $ (4,000,000)
Settlement of all outstanding principal and interest $ 298,000,000 $ 2,000,000 $ 1,000,000
Lease term   20 years  
Lease term extensions   5 years  
Number of lease term extensions | Lease_Agreement   2  
Lease term description The term of the lease is 20 years, with two five-year extensions at our option    
Fixed annual payments   $ 10,000,000  
Lease escalate percentage   3.00%  
Capital lease obligation $ 169,000,000 $ 156,000,000  
Number of interest rate swaps | Swap   1  
Two interest rate swap agreements [Member]      
Debt Instrument [Line Items]      
Notional amount of interest rate swaps   $ 50,000,000  
Leasing Arrangement [Member]      
Debt Instrument [Line Items]      
Capital lease obligation   153,000,000  
Senior Notes, interest at 7.375%, matured 2015 [Member]      
Debt Instrument [Line Items]      
Senior Notes 294,000,000 $ 294,000,000  
Settlement of all outstanding principal and interest $ 305,000,000    
Interest rate, stated rate 7.375% 7.375%  
Senior Notes, interest at 3.75%, maturing 2025 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 347,000,000 $ 346,000,000  
Proceeds from issuance of initial public offering   $ 350,000,000  
Interest rate, stated rate 3.75% 3.75%  
Maturity period of facility   Mar. 15, 2025  
Notes payment term, description Pay interest on the 2025 Notes on March 15 and September 15 each year until maturity.    
Debt instrument, redemption description Redeem all or a portion of the 2025 Notes at our option at any time prior to December 15, 2024 at the make-whole redemption price equal to the greater of (1) 100% of the aggregate principal amount of the 2025 Notes being redeemed, plus accrued and unpaid interest to, but excluding, the redemption date; and (2) the sum of the present values of the remaining scheduled payments of principal and interest in respect of the 2025 Notes being redeemed (exclusive of any interest accrued to the date of redemption) discounted to the redemption date on a semi-annual basis at the Treasury Rate (as defined in the supplemental indenture relating to the 2025 Notes) plus 25 basis points, plus accrued and unpaid interest to, but excluding, the redemption date. At any time on or after December 15, 2024, we may redeem all or a portion of the 2025 Notes at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest to, but excluding, the redemption date.    
Debt instrument redemption price percentage to principal amount 100.00%    
Debt instrument basis points 0.25%    
Senior Notes, interest at 4.50%, maturing 2034 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 292,000,000 $ 291,000,000  
Proceeds from issuance of initial public offering   $ 300,000,000  
Interest rate, stated rate 4.50% 4.50%  
Maturity period of facility   Oct. 01, 2034  
Notes payment term, description Pay interest on the 2034 Notes on April 1 and October 1 each year until maturity.    
Debt instrument, redemption description Redeem all or a portion of the 2034 Notes at our option at any time prior to April 1, 2034 at the make-whole redemption price equal to the greater of (1) 100% of the aggregate principal amount of the 2034 Notes being redeemed, plus accrued and unpaid interest to, but excluding, the redemption date; and (2) the sum of the present values of the remaining scheduled payments of principal and interest in respect of the 2034 Notes being redeemed (exclusive of any interest accrued to the date of redemption) discounted to the redemption date on a semi-annual basis at the Treasury Rate (as defined in the supplemental indenture relating to the 2034 Notes) plus 25 basis points, plus accrued and unpaid interest to, but excluding, the redemption date. At any time on or after April 1, 2034, we may redeem all or a portion of the 2034 Notes at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest to, but excluding, the redemption date.    
Debt instrument redemption price percentage to principal amount 100.00%    
Debt instrument basis points 0.25%    
Line Of Credit [Member]      
Debt Instrument [Line Items]      
Available borrowing capacity under its domestic and foreign lines of credit $ 1,340,000,000    
Amended Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity under credit facility borrowings   $ 1,750,000,000  
Maturity of credit facility   2020-02  
Commitment fees percentage rate   1.20%  
Extended maturity period   2 years  
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Deferred financing costs   $ 2,000,000  
(Gain) loss on debt extinguishment, net   1,000,000  
Commercial Paper Program [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Short-term unsecured notes issuance amount   $ 1,750,000,000