PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Pensions
Net Periodic Cost
Service cost	$ 282	$ 244	$ 273
Interest cost	474	480	439
Expected return on plan assets	(769)	(776)	(778)
Amortization of actuarial (gain) loss	223	177	265
Amortization of prior service (credit) cost	25	25	12
Other postemployment benefits	1	5
Settlements/curtailments	11	9	2
Net cost	$ 247	$ 164	$ 213
Weighted-Average Assumptions
Discount rates (as a percent)	4.00%	4.50%	3.80%
Rate of compensation increase (as a percent)	3.80%	3.80%	3.90%
Expected long-term rates of return (as a percent)	7.30%	7.50%	7.80%
Health Care and Life Insurance
Net Periodic Cost
Service cost	$ 46	$ 44	$ 58
Interest cost	259	267	255
Expected return on plan assets	(55)	(72)	(84)
Amortization of actuarial (gain) loss	91	33	141
Amortization of prior service (credit) cost	(77)	(3)	(8)
Settlements/curtailments	1	(1)
Net cost	$ 265	$ 268	$ 362
Weighted-Average Assumptions
Discount rates (as a percent)	4.20%	4.70%	3.80%
Expected long-term rates of return (as a percent)	7.00%	7.20%	7.50%