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Summary of Significant Accounting Policies Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 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	$ 12	$ 42	$ 43	$ 71
Costs and Expenses, Related Party	7	5	24	18
Accounts Receivable, Related Parties	4		4			$ 13
Accounts Payable, Related Parties	75		75			55
Navistar Defense [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	11	$ 28	25	$ 34
Accounts Receivable, Related Parties	$ 27		$ 27			$ 29