Leases - Supplemental Cash Flow Information Related to Leases (Details) $ in Millions	12 Months Ended
	Oct. 31, 2020 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 40
Right of use assets obtained in exchange for lease liabilities	$ 44
Finance Lease, Weighted Average Remaining Lease Term	3 years 4 months 24 days
Operating Lease, Weighted Average Remaining Lease Term	5 years 5 months 1 day
Finance Lease, Weighted Average Discount Rate, Percent	4.30%
Operating Lease, Weighted Average Discount Rate, Percent	4.50%