PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2012 plan
Pensions
Defined Benefit Plan Disclosure
Service cost	$ 68	$ 55	$ 204	$ 164
Interest cost	107	116	329	349
Expected return on plan assets	(193)	(197)	(583)	(590)
Amortization of actuarial (gain) loss	66	49	194	149
Amortization of prior service cost (credit)	9	10	25	31
Settlements/curtailments		1	1	3
Net cost	57	34	170	106
Defined benefit plan employer contributions			267
Defined benefit plan employer contributions expected for the remainder of the fiscal year	20		20
Health Care and Life Insurance
Defined Benefit Plan Disclosure
Service cost	14	12	43	35
Interest cost	64	70	191	210
Expected return on plan assets	(21)	(25)	(63)	(75)
Amortization of actuarial (gain) loss	35	45	105	105
Amortization of prior service cost (credit)	(2)	(3)	(4)	(11)
Net cost	90	99	272	264
Defined benefit plan employer contributions			19
Defined benefit plan employer contributions expected for the remainder of the fiscal year	$ 9		$ 9
Number of postretirement health care plans that became "almost all" inactive as described by applicable accounting standards					1