Financial Instruments (Details 4) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Derivative assets
Gross Amount Recognized	$ 496	$ 260
Net Amount Presented	496	260
Gross Amounts Not Offset
Derivatives	179	209
Financial Collateral	205	34
Net Amount	112	17
Derivative liabilities
Gross Amount Recognized	476	477
Net Amount Presented	476	477
Gross Amounts Not Offset
Derivatives	179	209
Financial Collateral	302	242
Net Amount	$ (5)	$ 26
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