Financial Instruments (Details 4) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Derivative assets
Gross Amount Recognized	$ 468	$ 496
Net Amount Presented	468	496
Gross Amounts Not Offset
Derivatives	123	179
Financial Collateral	263	205
Net Amount	82	112
Derivative liabilities
Gross Amount Recognized	147	476
Net Amount Presented	147	476
Gross Amounts Not Offset
Derivatives	123	179
Financial Collateral	19	302
Net Amount	$ 5	(5)
Period within which the funds held as collateral and posted as collateral are transferred from or to counterparties	2 days
Counterparty collateral	$ 19
Cash collateral posted		$ 302