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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Sep. 30, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |
Goodwill | $ 3,709 | $ 3,722 |  | $ 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 |  |  |
MBL Bioenergy |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percent | 99.99% |  |  |
Equity method investments | $ 78 | 0 |  |
Pine Run Midstream, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment ownership percent | 49.00% |  |  |
Equity method investments | $ 72 | 65 |  |
Pennant |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments |  | 97 |  |
Other Equity Investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 69 | $ 26 |  |

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