Financial Instruments - Schedule of Information Related to the Potential Effect of Entity's Master Netting Agreements and Collateral Security Agreements (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jul. 31, 2016	Oct. 31, 2015
Derivative assets
Gross Amount Recognized	$ 351	$ 258
Gross Amount Offset	0	0
Net Amount Presented	351	258
Gross Amounts Not Offset
Derivatives	135	162
Financial Collateral	201	9
Net Amount	15	87
Derivative liabilities
Gross Amount Recognized	160	304
Gross Amount Offset	0	0
Net Amount Presented	160	304
Gross Amounts Not Offset
Derivatives	135	162
Financial Collateral	10	0
Net Amount	$ 15	$ 142
Period to collateralize	2 days	2 days