Equity Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ (2,421)	$ (1,968)	$ (1,187)
Unrealized gains (losses) arising during the period	(1,559)	(285)	(726)
Reclassifications of realized net (gains) losses to net income	1	(168)	(55)
AOCI, Ending Balance	$ (3,979)	(2,421)	(1,968)
Estimated tax rate	37.00%
Market Value Adjustments, Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	$ 13	100	95
Unrealized gains (losses) arising during the period	13	(37)	109
Reclassifications of realized net (gains) losses to net income	0	(50)	(104)
AOCI, Ending Balance	26	13	100
Market Value Adjustments, Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	334	204	83
Unrealized gains (losses) arising during the period	(193)	421	169
Reclassifications of realized net (gains) losses to net income	(166)	(291)	(48)
AOCI, Ending Balance	(25)	334	204
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(2,497)	(2,196)	(1,271)
Unrealized gains (losses) arising during the period	(1,321)	(474)	(1,022)
Reclassifications of realized net (gains) losses to net income	167	173	97
AOCI, Ending Balance	(3,651)	(2,497)	(2,196)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning Balance	(271)	(76)	(94)
Unrealized gains (losses) arising during the period	(58)	(195)	18
Reclassifications of realized net (gains) losses to net income	0	0	0
AOCI, Ending Balance	$ (329)	$ (271)	$ (76)

Estimated statutory rate applied to other comprehensive income.

No definition available.

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+ References

No definition available.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581

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-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=51821188&loc=d3e1436-108581

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