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Acquisitions (Details) - USD ($) $ in Millions	Nov. 01, 2018	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill		$ 6,380	$ 6,372	$ 5,968
Apogee group
Business Combination, Separately Recognized Transactions [Line Items]
Goodwill	$ 382
Amortizable intangible assets	292
Net liabilities assumed	(196)
Total fair value of consideration	$ 478