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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