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Debt - Short Term Borrowings (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Short-term Debt [Line Items]        
Net cash deposit $ 118,000,000   $ 113,000,000  
Maximum borrowing capacity 2,750,000,000      
Short-term borrowings $ 1,098,000,000   259,000,000  
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 $ 112,000,000 € 98,000,000 108,000,000 € 90,000,000
Increase in restricted cash deposits 118,000,000      
Short-term borrowings 35,000,000   9,000,000  
U.S. Commercial Paper Notes [Member]        
Short-term Debt [Line Items]        
Maximum borrowing capacity 1,000,000,000      
Short-term borrowings $ 903,000,000   $ 70,000,000  
Weighted-average interest rate on notes outstanding 3.00% 3.00% 1.84% 1.84%
Debt maturity period Maturities less than three months.      
Euro-Commercial Paper Notes [Member]        
Short-term Debt [Line Items]        
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.      
Maximum borrowing capacity | €       € 500,000,000
Short-term borrowings $ 160,000,000 € 140,000,000 $ 180,000,000 € 150,000,000
Weighted-average interest rate on notes outstanding (0.24%) (0.24%) (0.22%) (0.22%)
Debt maturity period Maturities less than three months.      
Prepaid Expenses and Other [Member] | Bank Indebtedness [Member]        
Short-term Debt [Line Items]        
Net cash deposit $ 6,000,000   $ 5,000,000