Financial Instruments (Details 4) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Derivative assets
Gross Amount Recognized	$ 260	$ 717
Net Amount Presented	260	717
Gross Amounts Not Offset
Derivatives	209	207
Financial Collateral	34	465
Net Amount	17	45
Derivative liabilities
Gross Amount Recognized	477	219
Net Amount Presented	477	219
Gross Amounts Not Offset
Derivatives	209	207
Financial Collateral	242	10
Net Amount	$ 26	$ 2
Period within which the funds held as collateral and posted as collateral are transferred from or to counterparties	2 days
Cash collateral posted	$ 220
Re-use of counterparty collateral	$ 22