Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments not Designated as Hedging Instruments on the Consolidated Condensed Statements of Earnings (Details) - Interest and other, net - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Derivative Instruments, Gain (Loss)
(Loss) /Gain Recognized in Earnings on Derivatives	$ 25	$ (13)	$ 22	$ (39)
Foreign currency contracts
Derivative Instruments, Gain (Loss)
(Loss) /Gain Recognized in Earnings on Derivatives	25	(18)	17	(58)
Other derivatives
Derivative Instruments, Gain (Loss)
(Loss) /Gain Recognized in Earnings on Derivatives	$ 0	$ 5	$ 5	$ 19