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Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Detail) - Pension Plan
Dec. 31, 2018
Dec. 31, 2017
U.S.    
Benefit obligations    
Discount rate 4.30% 3.60%
International    
Benefit obligations    
Discount rate 2.60% 2.50%
Rate of compensation increase 2.30% 2.30%