One Percentage Point (ppt) Change on Projected Benefit Obligations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 29, 2012
Schedule of Defined Benefit Plan Change in Benefit Obligation [Line Items]
Impact of 1 ppt Discount Rate decrease on Benefit Expense	$ 265
Impact of 1 ppt Discount Rate increase on Benefit Expense	(226)
Impact of 1 ppt Discount Rate decrease on Projected Benefit Obligations	2,297
Impact of 1 ppt Discount Rate increase on Projected Benefit Obligations	(1,955)
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Decrease on Benefit Expense	82
Impact of 1 ppt Expected Long-Term Rate of Return on Assets Increase on Benefit Expense	(82)
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Net Periodic Postretirement Medical Cost	(41)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Net Periodic Postretirement Medical Cost	57
Impact of 1 ppt Healthcare Cost Trend Rate decrease on Projected Benefit Obligations	(254)
Impact of 1 ppt Healthcare Cost Trend Rate increase on Projected Benefit Obligations	$ 318

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Sensitivity Analysis Of Net Periodic Pension And Postretirement Cost, Impact Of 1 Percentage Point Decrease In Expected Long Term Rate Of Return On Assets

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- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Cost, Impact Of 1 Percentage Point Increase In Expected Long Term Rate Of Return On Assets

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- Definition

Sensitivity Analysis Of Net Periodic Pension And Postretirement Medical Cost, Impact Of 1 Percentage Point Decrease In Discount Rate

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Sensitivity Analysis Of Net Periodic Pension And Postretirement Medical Cost, Impact Of 1 Percentage Point Increase In Discount Rate

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- Definition

Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Decrease In Discount Rate

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- Definition

Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Decrease In Healthcare Cost Trend Rate

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Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Increase In Discount Rate

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Sensitivity Analysis Of Projected Benefit Obligations, Impact Of 1 Percentage Point Increase In Healthcare Cost Trend Rate

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ 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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-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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