Retirement and Post-Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	Oct. 31, 2013
U.S. Defined Benefit Plans
Net benefit costs
Interest cost	$ 142	$ 140	$ 284	$ 280
Expected return on plan assets	(202)	(211)	(405)	(423)
Amortization and deferrals:
Actuarial loss (gain)	4	19	8	39
Net periodic benefit (credit) cost	(56)	(52)	(113)	(104)
Settlement loss		3		8
Net benefit (credit) cost	(56)	(49)	(113)	(96)
Non-U.S. Defined Benefit Plans
Net benefit costs
Service cost	77	84	155	170
Interest cost	185	168	368	341
Expected return on plan assets	(286)	(250)	(568)	(507)
Amortization and deferrals:
Actuarial loss (gain)	80	85	158	172
Prior service benefit	(6)	(6)	(12)	(13)
Net periodic benefit (credit) cost	50	81	101	163
Curtailment gain	(5)		(5)
Settlement loss	2		2
Special termination benefits	22	2	28	5
Net benefit (credit) cost	69	83	126	168
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					617
Contributions to benefit plans			220
Expected contribution to benefit plans as of balance sheet date			397
U.S. non-qualified plan participants
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					33
Contributions to benefit plans			13
Expected contribution to benefit plans as of balance sheet date			20
Post-Retirement Benefit Plans
Net benefit costs
Service cost	1	2	3	3
Interest cost	8	8	16	15
Expected return on plan assets	(9)	(8)	(17)	(17)
Amortization and deferrals:
Actuarial loss (gain)	(2)		(5)
Prior service benefit	(10)	(17)	(21)	(34)
Net periodic benefit (credit) cost	(12)	(15)	(24)	(33)
Curtailment gain		(4)		(7)
Special termination benefits			(11)
Net benefit (credit) cost	(12)	(19)	(35)	(40)
Employer Contributions and Funding Policy
Expected contribution to defined benefit plans in fiscal 2014					109
Contributions to benefit plans			48
Expected contribution to benefit plans as of balance sheet date			$ 61

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The total amount of net periodic benefit cost (credit) for defined benefit plans for the period, before gain or loss due to settlements or curtailments.

+ References

No definition available.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Return on Plan Assets

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-Topic 715

-SubTopic 60

-Glossary Expected Return on Plan Assets

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(3)

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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- Definition

The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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- Definition

The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(7)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Plan Curtailment

-URI http://asc.fasb.org/extlink&oid=6520938

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

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- Definition

Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 15

-Paragraph 6

-Subparagraph (a)(1)

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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- Definition

The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

+ References

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