Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Apr. 30, 2015	Oct. 31, 2014
Derivative assets
Gross Amount Recognized	$ 1,393	$ 980
Net Amount Presented	1,393us-gaap_DerivativeAssets	980us-gaap_DerivativeAssets
Gross Amounts Not Offset
Derivatives	649	361
Derivative, Collateral, Obligation to Return Cash	752	452
Net Amount	(8)	167
Derivative liabilities
Gross Amount Recognized	697	405
Net Amount Presented	697us-gaap_DerivativeLiabilities	405us-gaap_DerivativeLiabilities
Gross Amounts Not Offset
Derivatives	649	361
Financial Collateral	28	29
Net Amount	$ 20	$ 15

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