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Postretirement Benefits - Expected Future Benefit Costs (Details) (USD $)
In Millions, unless otherwise specified
Oct. 31, 2014
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months $ 312us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
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Defined Benefit Plan, Expected Future Benefit Payments, Year Two 304us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
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Defined Benefit Plan, Expected Future Benefit Payments, Year Three 296us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
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Defined Benefit Plan, Expected Future Benefit Payments, Year Four 288us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
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Defined Benefit Plan, Expected Future Benefit Payments, Year Five 280us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
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Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 1,278us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
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Health and Life Insurance Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 143us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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Defined Benefit Plan, Expected Future Benefit Payments, Year Two 132us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
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Defined Benefit Plan, Expected Future Benefit Payments, Year Three 137us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
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Defined Benefit Plan, Expected Future Benefit Payments, Year Four 130us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
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Defined Benefit Plan, Expected Future Benefit Payments, Year Five 127us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
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Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter $ 600us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 [1]
[1] (A)Payments are net of expected participant contributions and expected federal subsidy receipts.