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Debt - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Commercial Paper Program
Debt Instrument [Line Items]
Debt instrument, maximum borrowing capacity		$ 3,000,000,000.0
Debt term (in years)		397 days
Commercial paper program, amount outstanding		$ 0	$ 0
Line of Credit | Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt term (in years)	5 years
Maximum borrowing capacity	$ 7,000,000,000.0
Amounts outstanding under credit facility		$ 0	$ 0

X

- 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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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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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Commercial Paper, Amount Outstanding

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