PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Pensions
Defined Benefit Plan Disclosure
Service cost	$ 61	$ 68	$ 184	$ 204
Interest cost	119	107	358	329
Expected return on plan assets	(192)	(193)	(578)	(583)
Amortization of actuarial (gain) loss	43	66	129	194
Amortization of prior service (credit) cost	6	9	18	25
Settlements/curtailments	2		8	1
Net cost	39	57	119	170
Defined benefit plan employer contributions			70
Defined benefit plan employer contributions expected for the remainder of the fiscal year			24
Health Care and Life Insurance
Defined Benefit Plan Disclosure
Service cost	11	14	33	43
Interest cost	66	64	197	191
Expected return on plan assets	(18)	(21)	(53)	(63)
Amortization of actuarial (gain) loss	8	35	25	105
Amortization of prior service (credit) cost		(2)	(2)	(4)
Net cost	67	90	200	272
Defined benefit plan employer contributions			26
Defined benefit plan employer contributions expected for the remainder of the fiscal year			$ 8