PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Pensions
Defined Benefit Plan Disclosure
Service cost	$ 70	$ 61	$ 212	$ 184
Interest cost	118	119	356	358
Expected return on plan assets	(192)	(192)	(577)	(578)
Amortization of actuarial (gain) loss	55	43	165	129
Amortization of prior service (credit) cost	7	6	19	18
Settlements/curtailments	4	2	5	8
Net cost	62	39	180	119
Defined benefit plan employer contributions			61
Defined benefit plan employer contributions expected for the remainder of the fiscal year			16
Health Care and Life Insurance
Defined Benefit Plan Disclosure
Service cost	12	11	35	33
Interest cost	65	66	194	197
Expected return on plan assets	(14)	(18)	(42)	(53)
Amortization of actuarial (gain) loss	22	8	68	25
Amortization of prior service (credit) cost	(19)		(57)	(2)
Net cost	$ 66	$ 67	198	$ 200
Defined benefit plan employer contributions			22
Defined benefit plan employer contributions expected for the remainder of the fiscal year			$ 5