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Postretirement Benefits - Effect of Changing Assumptions (Details) - Health and Life Insurance Benefits
$ in Millions
12 Months Ended
Oct. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components $ 12
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components (10)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 264
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation $ (219)