Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 24, 2015	Jan. 24, 2015
Restructuring Reserve [Roll Forward]
Liability as of beginning period		$ 69us-gaap_RestructuringReserve
Gross charges		387us-gaap_RestructuringCharges
Cash payments		(368)us-gaap_PaymentsForRestructuring
Non-cash items		(6)
Liability as of ending period	82us-gaap_RestructuringReserve	82us-gaap_RestructuringReserve
Fiscal 2014 plan and prior plans \| Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		40
Gross charges		0
Cash payments		(18)
Non-cash items		0
Liability as of ending period	22	22
Fiscal 2014 plan and prior plans \| Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		29
Gross charges		0
Cash payments		0
Non-cash items		(8)
Liability as of ending period	21	21
Fiscal 2015 plan
Restructuring Reserve [Roll Forward]
Gross charges	69	387
Fiscal 2015 plan \| Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0
Gross charges		386
Cash payments		(347)
Non-cash items		0
Liability as of ending period	39	39
Fiscal 2015 plan \| Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0
Gross charges		1
Cash payments		(3)
Non-cash items		2
Liability as of ending period	$ 0	$ 0

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.P.3)

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

+ Details

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- Details

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- Definition

Amount of consideration other than cash used to fully or partially settle an accrued restructuring cost.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b)(2))

-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

+ Details

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- Details

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- Details

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