Summary of Significant Accounting Policies Inventory (Tables)	9 Months Ended
	Jul. 31, 2020
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	Inventories Inventories are valued at the lower of cost and net realizable value. Cost is principally determined using the first-in, first-out method. Our gross used truck inventory was $200 million at July 31, 2020 and at October 31, 2019, offset by reserves of $63 million and $37 million, respectively.

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.