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PENSION AND OTHER POSTRETIREMENT BENEFITS - Assumptions (Details) - Health Care and Life Insurance - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Health care costs trend rates    
Weighted average composite trend rate for first fiscal year following balance sheet date (as a percent) 8.30% 0.80%
Weighted average composite trend rate for second fiscal year following balance sheet date (as a percent)   7.90%
Ultimate weighted-average composite trend rate (as a percent) 4.80% 4.80%
Year that weighted-average composite trend rate reaches ultimate rate (year) 2024 2024
The changes in the accumulated postretirement benefit obligation and the aggregate of service and interest cost components of net periodic postretirement benefits cost due to one percentage point change in the assumed health care cost trend rate    
Increase in accumulated postretirement benefit obligations due to one percentage point increase in the assumed health care cost trend rate $ 876  
Increase in aggregate of service and interest cost components of net periodic postretirement benefits cost for the year due to one percentage point increase in the assumed health care cost trend rate 36  
Decrease in accumulated postretirement benefit obligations due to one percentage point decrease in the assumed health care cost trend rate 673  
Decrease in aggregate of service and interest cost components of net periodic postretirement benefits cost for the year due to one percentage point decrease in the assumed health care cost trend rate $ 28