PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Retirement Benefits Adjustments Included in Other Comprehensive (Income) Loss:
Total (gain) loss recognized in other comprehensive (income) loss	$ 1,078	$ (3,086)	$ 961
Pensions
Benefit Plan Costs Recognized in Other Comprehensive Income
Net cost	164	213	160
Retirement Benefits Adjustments Included in Other Comprehensive (Income) Loss:
Net actuarial (gain) loss	940	(1,481)	999
Prior service (credit) cost		(26)	5
Amortization of actuarial (loss) gain	(177)	(265)	(202)
Amortization of prior service (cost) credit	(25)	(12)	(47)
Settlements/curtailments	(9)	(2)	(10)
Total (gain) loss recognized in other comprehensive (income) loss	729	(1,786)	745
Total recognized in comprehensive (income) loss	893	(1,573)	905
Health Care and Life Insurance
Benefit Plan Costs Recognized in Other Comprehensive Income
Net cost	268	362	351
Retirement Benefits Adjustments Included in Other Comprehensive (Income) Loss:
Net actuarial (gain) loss	748	(1,165)	335
Prior service (credit) cost	(370)	(2)	2
Amortization of actuarial (loss) gain	(33)	(141)	(136)
Amortization of prior service (cost) credit	3	8	15
Settlements/curtailments	1
Total (gain) loss recognized in other comprehensive (income) loss	349	(1,300)	216
Total recognized in comprehensive (income) loss	$ 617	$ (938)	$ 567

Amount recognized in net periodic benefit cost and other comprehensive income.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans.

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Amount before tax of gain (loss) adjustment to other comprehensive income (loss) resulting from settlement or curtailment of defined benefit pension and other postretirement defined benefit plans.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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Amount before tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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