PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Pensions
Defined Benefit Plan Disclosure
Service cost	$ 55	$ 50	$ 164	$ 149
Interest cost	116	124	349	372
Expected return on plan assets	(197)	(199)	(590)	(597)
Amortization of actuarial (gain) loss	49	39	149	112
Amortization of prior service cost (credit)	10	10	31	31
Settlements/curtailments	1	1	3	1
Net cost	34	25	106	68
Defined benefit plan employer contributions			408
Defined benefit plan employer contributions expected for the remainder of the fiscal year	26		26
Health Care and Life Insurance
Defined Benefit Plan Disclosure
Service cost	12	11	35	33
Interest cost	70	81	210	244
Expected return on plan assets	(25)	(28)	(75)	(85)
Amortization of actuarial (gain) loss	45	68	105	203
Amortization of prior service cost (credit)	(3)	(4)	(11)	(11)
Net cost	99	128	264	384
Defined benefit plan employer contributions			29
Defined benefit plan employer contributions expected for the remainder of the fiscal year	$ 10		$ 10
Number of postretirement health care plans that became "almost all" inactive as described by applicable accounting standards			1