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Revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |
Contract liabilities | $ 116 | $ 133 | $ 158
Revenue recognized | 118 | $ 118 |
Midstream & Marketing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Expected revenue | 2,200 |  |
Utilities |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Expected revenue | $ 200 |  |

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