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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities | $ 132 | $ 140 |
Contract liabilities, recognized revenue | 101 | $ 120 | $ 127
Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Remaining performance obligations | $ 1,300 |  |
Natural Gas Transportation and Gathering Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 30 years |  |
Storage Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 1 year |  |
Natural Gas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Term of contract with customer (up to) | 15 years |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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