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Debt - Schedule of Receivables Facility (Details) - Energy Services Receivables Facility - Receivables Facility - Energy Services - USD ($)	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Short-term Debt [Line Items]
Trade receivables transferred to ESFC during the year	$ 1,406,000,000	$ 1,324,000,000	$ 1,946,000,000
ESFC trade receivables sold to the bank during the year	125,000,000	336,000,000	535,000,000
ESFC trade receivables - end of year	69,000,000	51,000,000	$ 62,000,000
Outstanding balance of trade receivables sold	17,000,000	$ 0
Borrowings	125,000,000
Repayments	$ 108,000,000

X

- Definition

Outstanding balance of ESFC trade receivables.

+ References

No definition available.

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- Definition

Sale of trade receivables to consolidated special purpose subsidiary.

+ References

No definition available.

+ Details

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X

- Definition

Trade receivables sold to commercial paper conduit.

+ References

No definition available.

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- Definition

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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- Definition

The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

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- Definition

The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

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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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No definition available.

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