PENSION AND OTHER POSTRETIREMENT BENEFITS - Plan Obligations and Assumptions and Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Pensions
Change in benefit obligations
Beginning of year balance	$ (12,186)	$ (12,190)
Service cost	(254)	(282)	$ (244)
Interest cost	(391)	(474)	(480)
Actuarial gain (loss)	(1,001)	(174)
Amendments	(1)	(66)
Benefits paid	702	781
Other postemployment benefits	(2)	(1)
Settlements/curtailments	6	2
Foreign exchange and other	41	218
End of year balance	(13,086)	(12,186)	(12,190)
Change in plan assets (fair value)
Beginning of year balance	11,164	11,447
Actual return on plan assets	628	582
Employer contribution	80	83
Benefits paid	(702)	(781)
Settlements	(3)	(2)
Foreign exchange and other	(30)	(165)
End of year balance	11,137	11,164	11,447
Funded status	$ (1,949)	$ (1,022)
Weighted-average assumptions
Discount rates (as a percent)	3.60%	4.10%
Rate of compensation increase (as a percent)	3.80%	3.80%
Health Care and Life Insurance
Change in benefit obligations
Beginning of year balance	$ (6,084)	$ (6,304)
Service cost	(38)	(46)	(44)
Interest cost	(204)	(259)	(267)
Actuarial gain (loss)	(478)	172
Amendments	3	3
Benefits paid	321	344
Health care subsidies	(16)	(20)
Settlements/curtailments		1
Foreign exchange and other	(4)	25
End of year balance	(6,500)	(6,084)	(6,304)
Change in plan assets (fair value)
Beginning of year balance	689	957
Actual return on plan assets	17	24
Employer contribution	47	48
Benefits paid	(321)	(344)
Foreign exchange and other	3	4
End of year balance	435	689	$ 957
Funded status	$ (6,065)	$ (5,395)
Weighted-average assumptions
Discount rates (as a percent)	3.80%	4.30%