PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Pensions
Net Periodic Cost
Service cost	$ 273	$ 220	$ 197
Interest cost	439	465	492
Expected return on plan assets	(778)	(787)	(793)
Amortization of actuarial (gains) losses	265	202	148
Amortization of prior service cost (credit)	12	47	46
Early-retirement benefits		3
Settlements/curtailments	2	10	1
Net cost	213	160	91
Weighted-Average Assumptions
Discount rates (as a percent)	3.80%	4.40%	5.00%
Rate of compensation increase (as a percent)	3.90%	3.90%	3.90%
Expected long-term rates of return (as a percent)	7.80%	8.00%	8.10%
Health Care and Life Insurance
Net Periodic Cost
Service cost	58	49	44
Interest cost	255	281	326
Expected return on plan assets	(84)	(100)	(113)
Amortization of actuarial (gains) losses	141	136	271
Amortization of prior service cost (credit)	(8)	(15)	(16)
Net cost	$ 362	$ 351	$ 512
Weighted-Average Assumptions
Discount rates (as a percent)	3.80%	4.40%	5.20%
Expected long-term rates of return (as a percent)	7.50%	7.70%	7.70%
Number of postretirement health care plans that became "almost all" inactive as described by applicable accounting standards		1