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AmeriGas Merger, Acquisitions and Dispositions - Components of the Final CMG Purchase Price Allocation (Details) - USD ($)
$ in Millions
Aug. 01, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Liabilities assumed:        
Goodwill   $ 3,770 $ 3,518 $ 3,456
CMG        
Assets acquired:        
Accounts receivable $ 10      
Prepaid expenses and other current assets 1      
Property, plant and equipment 614      
Investment in Pennant 88      
Intangible assets 250      
Total assets acquired 963      
Liabilities assumed:        
Accounts payable 3      
Total liabilities assumed 3      
Goodwill 324      
Net consideration transferred (including working capital adjustments) $ 1,284      
CMG | Customer Relationships        
Liabilities assumed:        
Average intangible amortization period 35 years