Reconciliation of Segment Operating Income to Income before Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Reconciling Items for Operating Income (Loss) from Segment to Consolidated
Segment operating income	$ 3,482us-gaap_OperatingIncomeLoss	$ 3,353us-gaap_OperatingIncomeLoss	$ 7,027us-gaap_OperatingIncomeLoss	$ 6,373us-gaap_OperatingIncomeLoss
Corporate and unallocated shared expenses	(170)us-gaap_OtherGeneralExpense	(155)us-gaap_OtherGeneralExpense	(295)us-gaap_OtherGeneralExpense	(271)us-gaap_OtherGeneralExpense
Restructuring and impairment charges	0	(48)	0	(67)
Other expense, net	0us-gaap_NonoperatingIncomeExpense	(37)us-gaap_NonoperatingIncomeExpense	0us-gaap_NonoperatingIncomeExpense	(31)us-gaap_NonoperatingIncomeExpense
Interest income/(expense), net	8us-gaap_InterestIncomeExpenseNet	62us-gaap_InterestIncomeExpenseNet	(50)us-gaap_InterestIncomeExpenseNet	111us-gaap_InterestIncomeExpenseNet
Income before income taxes	$ 3,320	$ 3,175	$ 6,682	$ 6,115

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

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

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

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- Definition

The net amount of operating interest income (expense).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

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-Paragraph 1

-Subparagraph (SX 210.9-04.10)

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- Definition

The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

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