Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 30, 2018	Oct. 31, 2017
Derivative assets
Gross Amount Recognized	$ 239	$ 260
Gross Amount Offset	0	0
Net Amount Presented	239	260
Gross Amounts Not Offset
Derivatives	208	209
Financial Collateral	11	34
Net Amount	20	17
Derivative liabilities
Gross Amount Recognized	678	477
Gross Amount Offset	0	0
Net Amount Presented	678	477
Gross Amounts Not Offset
Derivatives	208	209
Financial Collateral	490	242
Net Amount	(20)	26
Cash collateral	480	220
Counterparty collateral	$ 10	$ 22