PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Nov. 01, 2015	Jan. 31, 2016	Jan. 31, 2015	Oct. 31, 2016
Forecasted
Net Periodic Cost
Decrease in service and interest costs compared to previous method				$ 175
Pensions
Net Periodic Cost
Service cost		$ 64	$ 73
Interest cost		98	119
Expected return on plan assets		(193)	(193)
Amortization of actuarial (gain) loss		52	55
Amortization of prior service (credit) cost		4	6
Settlements/curtailments		7	1
Net cost		32	61
Defined benefit plan employer contributions		31
Defined benefit plan employer contributions expected for the remainder of the fiscal year		46
Service cost discount rates (as a percent)	4.30%
Interest cost discount rates (as a percent)	3.40%
Discount rates (as a percent)	4.10%
Health Care and Life Insurance
Net Periodic Cost
Service cost		9	11
Interest cost		51	65
Expected return on plan assets		(9)	(14)
Amortization of actuarial (gain) loss		19	23
Amortization of prior service (credit) cost		(19)	(19)
Net cost		51	$ 66
Defined benefit plan employer contributions		13
Defined benefit plan employer contributions expected for the remainder of the fiscal year		$ 12
Service cost discount rates (as a percent)	5.00%
Interest cost discount rates (as a percent)	3.50%
Discount rates (as a percent)	4.30%