PENSION AND OTHER POSTRETIREMENT BENEFITS - Other (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Amounts recognized in balance sheet
Noncurrent asset	$ 93.6	$ 215.6
Pensions
Amounts recognized in balance sheet
Noncurrent asset	94.0	216.0
Current liability	(33.0)	(44.0)
Noncurrent liability	(2,010.0)	(1,194.0)
Funded status	(1,949.0)	(1,022.0)
Amounts recognized in accumulated other comprehensive income - pretax
Net actuarial loss	5,309.0	4,393.0
Prior service cost (credit)	67.0	83.0
Total	5,376.0	4,476.0
Accumulated Benefit Obligations - Additional Disclosures
Accumulated benefit obligation for pension plans	12,410.0	11,508.0
Accumulated Benefit Obligations in Excess of Plan Assets
Accumulated benefit obligations for pension plans with accumulated benefit obligations in excess of plan assets	8,402.0	7,254.0
Fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets	7,016.0	6,669.0
Projected Benefit Obligations in Excess of Plan Assets
Projected benefit obligations for pension plans with projected benefit obligations in excess of plan assets	9,157.0	8,196.0
Fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets	7,114.0	6,958.0
Amounts in accumulated other comprehensive income that are expected to be amortized as net expense (income) during fiscal 2017
Net actuarial loss	240.0
Prior service cost (credit)	12.0
Total	252.0
Expected future employer contributions towards defined benefit plans, which are primarily direct benefit payments for unfunded plans	59.0
Benefits expected to be paid from the benefit plans, which reflect expected future years of service
2017	717.0
2018	721.0
2019	709.0
2020	707.0
2021	696.0
2022 to 2026	3,454.0
Health Care and Life Insurance
Amounts recognized in balance sheet
Current liability	(32.0)	(20.0)
Noncurrent liability	(6,033.0)	(5,375.0)
Funded status	(6,065.0)	(5,395.0)
Amounts recognized in accumulated other comprehensive income - pretax
Net actuarial loss	1,865.0	1,442.0
Prior service cost (credit)	(259.0)	(334.0)
Total	1,606.0	$ 1,108.0
Amounts in accumulated other comprehensive income that are expected to be amortized as net expense (income) during fiscal 2017
Net actuarial loss	101.0
Prior service cost (credit)	(77.0)
Total	24.0
Expected future employer contributions towards defined benefit plans, which are primarily direct benefit payments for unfunded plans	38.0
Benefits expected to be paid from the benefit plans, which reflect expected future years of service
2017	339.0
2018	353.0
2019	356.0
2020	358.0
2021	362.0
2022 to 2026	$ 1,834.0