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Retirement, Pension and Other Postretirement Plans - Weighted Average Assumptions Representing the Rates Used to Develop the Actuarial Present Value of Projected Benefit Obligation and the Net Periodic Benefit Costs (Detail)
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Pension Plans | United States      
Assumptions used to determine benefit obligations at October 31:      
Discount rate 2.85% 3.25% 4.53%
Rate of compensation increase 4.00% 4.00% 3.90%
Assumptions used to determine net benefit costs for the years ended October 31:      
Discount rate - benefit obligation 3.25% 4.53% 3.80%
Discount rate - service cost 3.56% 4.70% 4.01%
Discount rate - interest cost 2.78% 4.15% 3.31%
Expected return on plan assets 5.75% 6.00% 6.00%
Rate of compensation increase 4.00% 3.90% 3.61%
Pension Plans | International      
Assumptions used to determine benefit obligations at October 31:      
Discount rate 1.01% 1.26% 2.14%
Rate of compensation increase 2.69% 3.12% 3.12%
Assumptions used to determine net benefit costs for the years ended October 31:      
Discount rate - benefit obligation 1.26% 2.14% 2.07%
Discount rate - service cost 1.12% 1.82% 1.76%
Discount rate - interest cost 1.05% 1.90% 1.83%
Expected return on plan assets 3.22% 3.96% 3.91%
Rate of compensation increase 3.12% 3.12% 3.13%
Retirement Plans | United States      
Assumptions used to determine benefit obligations at October 31:      
Discount rate 2.84% 3.27% 4.56%
Health care cost trend rate 3.40% 3.62% 3.75%
Rate to which health care cost trend rate is assumed to incline/decline (ultimate trend rate) 3.17% 3.24% 3.27%
Year the rate reaches the ultimate trend rate 2026 2026 2026
Assumptions used to determine net benefit costs for the years ended October 31:      
Discount rate - benefit obligation 3.27% 4.56% 3.86%
Discount rate - service cost 3.61% 4.77% 4.11%
Discount rate - interest cost 2.79% 4.18% 3.39%
Retirement Plans | International      
Assumptions used to determine benefit obligations at October 31:      
Discount rate 2.94% 3.03% 3.88%
Health care cost trend rate 4.22% 4.00% 6.35%
Rate to which health care cost trend rate is assumed to incline/decline (ultimate trend rate) 4.05% 4.05% 3.50%
Year the rate reaches the ultimate trend rate 2040 2040 2037
Assumptions used to determine net benefit costs for the years ended October 31:      
Discount rate - benefit obligation 3.03% 3.88% 3.52%
Discount rate - service cost 3.05% 3.90% 3.54%
Discount rate - interest cost 2.88% 3.80% 3.40%