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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |
Goodwill | $ 3,697 | $ 3,748 | $ 3,612
AmeriGas Propane |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of fair value exceeding carrying value | 30.00% |  |
Goodwill | $ 2,000 |  |
Pennant | Energy Services |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity interest acquired | 53.00% |  |
Purchase price | $ 61 |  |
Pine Run Midstream, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment ownership percent | 49.00% |  |
Equity method investments | $ 71 | 62 |
Pennant |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investments |  | 99 |
Other Equity Investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Loss on extinguishment of debt | $ 104 | $ 22 |

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