Leases Balance Sheet Information (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Leases [Abstract]
Operating lease right of use assets	$ 119	$ 0
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	2
Lease, Right-of-Use Asset	121
Operating Lease, Liability, Current	30
Operating Lease, Liability, Noncurrent	92
Finance Lease, Liability, Current	1
Finance Lease, Liability, Noncurrent	1
Lease, Liability	$ 124
Finance Lease, Weighted Average Remaining Lease Term	9 years
Operating Lease, Weighted Average Remaining Lease Term	5 years 7 months 6 days
Finance Lease, Weighted Average Discount Rate, Percent	5.90%
Operating Lease, Weighted Average Discount Rate, Percent	4.40%