PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Pensions
Defined Benefit Plan Disclosure
Service cost	$ 56	$ 50	$ 109	$ 99
Interest cost	117	124	233	248
Expected return on plan assets	(197)	(199)	(393)	(398)
Amortization of actuarial (gain) loss	48	35	100	73
Amortization of prior service cost (credit)	11	11	21	21
Settlements/curtailments	1		2
Net cost	36	21	72	43
Defined benefit plan employer contributions			238
Defined benefit plan employer contributions expected for the remainder of the fiscal year	197		197
Health Care and Life Insurance
Defined Benefit Plan Disclosure
Service cost	11	11	23	22
Interest cost	69	82	140	163
Expected return on plan assets	(25)	(29)	(50)	(57)
Amortization of actuarial (gain) loss		68	60	135
Amortization of prior service cost (credit)	(5)	(3)	(8)	(7)
Net cost	50	129	165	256
Number of postretirement health care plans that became "almost all" inactive as described by applicable accounting standards			1
Defined benefit plan employer contributions			21
Defined benefit plan employer contributions expected for the remainder of the fiscal year	$ 7		$ 7