Financial Instruments - Gross Notional FV and Offsetting (Details) - USD ($) $ in Millions	Jan. 31, 2017	Oct. 31, 2016
Derivative assets
Gross Amount Recognized	$ 551	$ 769
Net Amount Presented	551	769
Gross Amounts Not Offset
Derivatives	260	214
Financial Collateral	260	465
Net Amount	31	90
Derivative liabilities
Gross Amount Recognized	397	228
Net Amount Presented	397	228
Gross Amounts Not Offset
Derivatives	260	214
Financial Collateral	48	10
Net Amount	$ 89	$ 4