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Debt - Short Term Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Short-term Debt [Line Items]          
Net cash deposit     $ 113,000,000   $ 194,000,000
Maximum borrowing capacity     2,750,000,000    
Short-term borrowings     259,000,000   623,000,000
Bank Indebtedness [Member]          
Short-term Debt [Line Items]          
Covenant percentage USD cash deposit to outstanding euro balance 105.00%        
Gross amount outstanding under the credit facility   € 90,000,000 108,000,000 € 175,000,000 185,000,000
Increase in restricted cash deposits $ 113,000,000        
Short-term borrowings     9,000,000   8,000,000
U.S. Commercial Paper Notes [Member]          
Short-term Debt [Line Items]          
Maximum borrowing capacity     500,000,000    
Short-term borrowings     $ 70,000,000   $ 295,000,000
Weighted-average interest rate on notes outstanding   1.84% 1.84% 1.04% 1.04%
Debt maturity period Maturities less than three months.        
Euro-Commercial Paper Notes [Member]          
Short-term Debt [Line Items]          
Maximum borrowing capacity | €   € 500,000,000      
Short-term borrowings   € 150,000,000 $ 180,000,000 € 304,000,000 $ 320,000,000
Weighted-average interest rate on notes outstanding   (0.22%) (0.22%) (0.07%) (0.07%)
Debt maturity period Maturities less than three months.        
Debt issuance description Under the euro-Program, the Company may issue euro-commercial paper notes [the “euro notes”] up to a maximum aggregate amount of €500 million or its equivalent in alternative currencies.        
Prepaid Expenses and Other [Member] | Bank Indebtedness [Member]          
Short-term Debt [Line Items]          
Net cash deposit     $ 5,000,000   $ 9,000,000