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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - Interest and other, net - Interest rate contracts - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
(Loss) Gain Recognized in Income on Derivative Instruments $ (11) $ (60) $ 10
(Loss) Gain Recognized on Related Hedged Item $ 11 $ 60 $ (10)