Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest rate contracts - Interest and other, net - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Earnings on Derivative	$ 20	$ (26)	$ 38	$ 35
Gain (Loss) Recognized on Related Hedged Item	$ (20)	$ 26	$ (38)	$ (35)