Financial Instruments (Details 4) - USD ($) $ in Millions	Jul. 31, 2015	Oct. 31, 2014
Derivative assets
Gross Amount Recognized	$ 1,314	$ 980
Net Amount Presented	1,314	980
Gross Amounts Not Offset
Derivatives	448	361
Derivative, Collateral, Obligation to Return Cash	756	452
Net Amount	110	167
Derivative liabilities
Gross Amount Recognized	491	405
Net Amount Presented	491	405
Gross Amounts Not Offset
Derivatives	448	361
Financial Collateral	$ 43	29
Net Amount		$ 15