Debt - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 25, 2021	Sep. 26, 2020	Sep. 28, 2019
Debt Instrument [Line Items]
Commercial paper	$ 6,000	$ 4,996
Proceeds from repurchase agreements		5,200
Repayments of repurchase agreements		(5,200)
Floating- and fixed-rate notes, aggregate principal amount	118,063	106,078
Interest expense on term debt	2,600	2,800	$ 3,200
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 6,000	$ 5,000
Commercial paper, general maturity period (less than)	9 months
Commercial paper, weighted-average interest rate	0.06%	0.62%
Level 2
Debt Instrument [Line Items]
Floating- and fixed-rate notes, aggregate fair value	$ 125,300	$ 117,100

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of cash inflow from short-term debt classified as other.

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- Definition

Amount of cash outflow for the payment of debt classified as other, maturing within one year or the operating cycle, if longer.

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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