Financial Instruments - Pre-tax Effect of Derivative Instruments Not Designated as Hedging Instruments on the Condensed Consolidated and Combined Statements of Earnings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	$ 105	$ 260	$ (116)	$ (129)
Foreign currency contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	108	261	(123)	(129)
Other derivatives | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	$ (3)	$ (1)	$ 7	$ 0