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Summary of Significant Accounting Policies Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019	Jan. 31, 2020	Oct. 31, 2019
Navistar Defense [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage					30.00%
Traton Group [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 29	$ 42	$ 72	$ 113
Costs and Expenses, Related Party	13	11	37	29
Accounts Receivable, Related Parties	7		7			$ 13
Accounts Payable, Related Parties	84		84			55
Navistar Defense [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	12	$ 9	37	$ 43
Accounts Receivable, Related Parties	$ 27		$ 27			$ 29