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Equity Changes in Accumulated Other Comprehensive Loss, Before Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Sep. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	$ (10,702)	$ (8,459)	$ (4,849)
Unrealized gains (losses) arising during the period	1,693	(2,527)	(3,680)
Reclassifications of realized net (gains) losses to net income	785	284	93
AOCI reclassifications to retained earnings, before tax			(23)
AOCI before Tax, Attributable to Parent, Ending Balance	(8,224)	(10,702)	(8,459)
Market Value Adjustments for Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(191)	129	201
Unrealized gains (losses) arising during the period	70	(57)	136
Reclassifications of realized net (gains) losses to net income	(31)	(263)	(185)
AOCI reclassifications to retained earnings, before tax			(23)
AOCI before Tax, Attributable to Parent, Ending Balance	(152)	(191)	129
Unrecognized Pension and Postretirement Medical Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(9,423)	(7,502)	(4,323)
Unrealized gains (losses) arising during the period	1,582	(2,468)	(3,457)
Reclassifications of realized net (gains) losses to net income	816	547	278
AOCI reclassifications to retained earnings, before tax			0
AOCI before Tax, Attributable to Parent, Ending Balance	(7,025)	(9,423)	(7,502)
Foreign Currency Translation and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI before Tax, Attributable to Parent, Beginning Balance	(1,088)	(1,086)	(727)
Unrealized gains (losses) arising during the period	41	(2)	(359)
Reclassifications of realized net (gains) losses to net income	0	0	0
AOCI reclassifications to retained earnings, before tax			0
AOCI before Tax, Attributable to Parent, Ending Balance	$ (1,047)	$ (1,088)	$ (1,086)

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AOCI reclassifications to retained earnings, before tax

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Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, attributable to parent. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners).

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

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