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Debt - Schedule of Receivables Facility (Details) - Energy Services Receivables Facility - Receivables Facility - Energy Services - USD ($) | 12 Months Ended
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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 |  |

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- Definition Outstanding balance of ESFC trade receivables. + References No definition available. + Details
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- Definition Sale of trade receivables to consolidated special purpose subsidiary. + References No definition available. + Details
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- Definition Trade receivables sold to commercial paper conduit. + References No definition available. + Details
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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 + Details
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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 + Details
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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) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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