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Debt - Short Term Borrowings (Detail)
€ in Millions
Oct. 12, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Short-term Debt [Line Items]          
Short term borrowings   $ 1,098,000,000   $ 259,000,000  
Borrowings under revolving credit facility   2,750,000,000      
364 Day Syndicated Revolving Credit Facility [Member]          
Short-term Debt [Line Items]          
Borrowings under revolving credit facility $ 300,000,000        
Line of credit   0      
Line of credit facility, expiration period 364 days        
Bank Indebtedness [Member]          
Short-term Debt [Line Items]          
Short term borrowings   35,000,000   9,000,000  
Line of credit   112,000,000 € 98 108,000,000 € 90
Commercial Paper [Member]          
Short-term Debt [Line Items]          
Short term borrowings   $ 1,063,000,000   $ 250,000,000