PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Pensions
Net Periodic Cost
Service cost	$ 220	$ 197	$ 176
Interest cost	465	492	510
Expected return on plan assets	(787)	(793)	(761)
Amortization of actuarial (gain) loss	202	148	113
Amortization of prior service cost (credit)	47	46	42
Early-retirement benefits	3
Settlements/curtailments	10	1	24
Net cost	160	91	104
Weighted-Average Assumptions
Discount rates (as a percent)	4.40%	5.00%	5.50%
Rate of compensation increase (as a percent)	3.90%	3.90%	3.90%
Expected long-term rates of return (as a percent)	8.00%	8.10%	8.30%
Health Care and Life Insurance
Net Periodic Cost
Service cost	49	44	44
Interest cost	281	326	337
Expected return on plan assets	(100)	(113)	(122)
Amortization of actuarial (gain) loss	136	271	311
Amortization of prior service cost (credit)	(15)	(16)	(16)
Net cost	$ 351	$ 512	$ 554
Weighted-Average Assumptions
Discount rates (as a percent)	4.40%	5.20%	5.60%
Expected long-term rates of return (as a percent)	7.70%	7.70%	7.80%
Number of postretirement health care plans that became "almost all" inactive as described by applicable accounting standards	1