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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