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PENSION AND OTHER POSTRETIREMENT BENEFITS - Components of Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2015
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 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 $ 70 $ 190 $ 212  
Interest cost   98 118 293 356  
Expected return on plan assets   (194) (192) (581) (577)  
Amortization of actuarial (gain) loss   51 55 155 165  
Amortization of prior service (credit) cost   4 7 12 19  
Settlements/curtailments   1 4 10 5  
Net cost   24 62 79 180  
Defined benefit plan employer contributions       64    
Defined benefit plan employer contributions expected for the remainder of the fiscal year       16    
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 12 28 35  
Interest cost   51 65 153 194  
Expected return on plan assets   (8) (14) (26) (42)  
Amortization of actuarial (gain) loss   18 22 55 68  
Amortization of prior service (credit) cost   (19) (19) (58) (57)  
Net cost   $ 51 $ 66 152 $ 198  
Defined benefit plan employer contributions       24    
Defined benefit plan employer contributions expected for the remainder of the fiscal year       $ 2    
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%