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PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Pensions
        
Defined Benefit Plan Disclosure        
Service cost $ 62 $ 69 $ 123 $ 136
Interest cost 120 112 239 222
Expected return on plan assets (193) (196) (386) (390)
Amortization of actuarial (gain) loss 43 63 86 128
Amortization of prior service (credit) cost 6 8 12 16
Settlements/curtailments 4 1 6 1
Net cost 42 57 80 113
Defined benefit plan employer contributions     47  
Defined benefit plan employer contributions expected for the remainder of the fiscal year     43  
Health Care and Life Insurance
        
Defined Benefit Plan Disclosure        
Service cost 11 15 22 29
Interest cost 65 63 131 127
Expected return on plan assets (17) (21) (35) (42)
Amortization of actuarial (gain) loss 8 34 17 70
Amortization of prior service (credit) cost (1) (1) (2) (2)
Net cost 66 90 133 182
Defined benefit plan employer contributions     18  
Defined benefit plan employer contributions expected for the remainder of the fiscal year     $ 9