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Summary of Significant Accounting Policies Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019	Jul. 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	$ 31	$ 29
Costs and Expenses, Related Party	17	13
Accounts Receivable, Related Parties			$ 13	$ 17
Accounts Payable, Related Parties			55	69
Navistar Defense [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 14	$ 6
Accounts Receivable, Related Parties			$ 29	$ 27