Employee severance charges.

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Favorable Adjustment as a result of Global Workforce Reduction.

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Favorable adjustment as a result of restructuring program.

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Length of time to implement restructuring plan announced on November 11, 2009.

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Reduction in global workforce.

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Reduction in Global Workforce in percent.

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Restructuring and Asset Impairments.

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Revised global workforce reduction.

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Severance accrual associated with plan announced.

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Severance accrual associated with restructuring reserves.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Restructuring Charges and Asset Impairments (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended					3 Months Ended			3 Months Ended	9 Months Ended
	Jul. 31, 2011	May 01, 2011	Jan. 30, 2011	May 02, 2010	Jan. 31, 2010	Oct. 25, 2009	May 01, 2011 Employee Severance [Member]	Jan. 30, 2011 Employee Severance [Member]	Jul. 31, 2011 Employee Severance [Member]	Oct. 31, 2010 Employee Severance [Member]	Jul. 31, 2011 Facilities [Member]	May 01, 2011 Restructuring Reserves Related to Other Restructuring Plans [Member]	Aug. 01, 2010 Restructuring Reserves Related to Other Restructuring Plans [Member]	Jul. 31, 2011 Restructuring Reserves Related to Other Restructuring Plans [Member]	Aug. 01, 2010 Energy and Environmental Solutions [Member]	Jul. 31, 2011 Energy and Environmental Solutions [Member]	Jul. 21, 2010 Energy and Environmental Solutions [Member] Minimum [Member]	Jul. 21, 2010 Energy and Environmental Solutions [Member] Maximum [Member]	Oct. 25, 2009 Minimum [Member]	Oct. 25, 2009 Maximum [Member]
Restructuring and Asset Impairments (Textuals) [Abstract]
Reduction in global workforce																	400	500	1,300	1,500
Restructuring Charges					$ 104
Reduction in Global Workforce in percent																			10.00%	12.00%
Length of time to implement restructuring plan announced on November 11, 2009						18 months
Revised global workforce reduction								200					1,000
Employee severance charges															45
Favorable Adjustment as a result of Global Workforce Reduction							8	28				19	20			36
Impairment charges of intangible assets and purchased technology		24
Assets impairment charges	3		3	9
Restructuring Reserve							18	53	11	99	5
Favorable adjustment as a result of restructuring program		1	4
Severance accrual associated with restructuring reserves														10		1
Severance accrual associated with plan announced on November 11, 2009		$ 0