Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Oct. 02, 2021
Income Taxes [Line Items]
Gross unrecognized tax benefits that would reduce income tax expense and effective tax rate, if recognized	$ 1,800	$ 1,900	$ 2,000
Accrued interest and penalties related to unrecognized tax benefits	1,000	1,000	1,000
Additional accrued interest related to unrecognized tax benefits	210	157	191
Reductions in accrued interest as a result of audit settlements and other prior-year adjustments	241	119	256
Unrecognized tax benefits, reasonably possible reduction due to payments for or resolution of open tax matters	300
Adjustments to Income Tax Expense, Income Tax Benefit from Share-based Compensation	$ 93	$ 2	$ 135