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, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	$ 260	$ (198)	$ (129)	$ (242)
Foreign currency contracts | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	261	(199)	(129)	(246)
Other derivatives | Interest and other, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Earnings on Derivatives	$ (1)	$ 1	$ 0	$ 4