PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 3) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013
Pensions
Change in benefit obligations
Beginning of year balance	$ (12,190)	$ (10,968)
Service cost	(282)	(244)	$ (273)
Interest cost	(474)	(480)	(439)
Actuarial gain (loss)	(174)	(1,306)
Amendments	(66)
Benefits paid	781	675
Other postemployment benefits	(1)	(5)
Settlements/curtailments	2	2
Foreign exchange and other	218	136
End of year balance	(12,186)	(12,190)	(10,968)
Change in plan assets (fair value)
Beginning of year balance	11,447	11,008
Actual return on plan assets	582	1,132
Employer contribution	83	87
Benefits paid	(781)	(675)
Settlements/curtailments	(2)	(2)
Foreign exchange and other	(165)	(103)
End of year balance	11,164	11,447	11,008
Funded status	$ (1,022)	$ (743)
Weighted-average assumptions
Discount rates (as a percent)	4.10%	4.00%
Rate of compensation increase (as a percent)	3.80%	3.80%
Health Care and Life Insurance
Change in benefit obligations
Beginning of year balance	$ (6,304)	$ (5,926)
Service cost	(46)	(44)	(58)
Interest cost	(259)	(267)	(255)
Actuarial gain (loss)	172	(757)
Amendments	3	370
Benefits paid	344	336
Health care subsidies	(20)	(22)
Settlements/curtailments	1
Foreign exchange and other	25	6
End of year balance	(6,084)	(6,304)	(5,926)
Change in plan assets (fair value)
Beginning of year balance	957	1,157
Actual return on plan assets	24	81
Employer contribution	48	51
Benefits paid	(344)	(336)
Foreign exchange and other	4	4
End of year balance	689	957	$ 1,157
Funded status	$ (5,395)	$ (5,347)
Weighted-average assumptions
Discount rates (as a percent)	4.30%	4.20%