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AmeriGas Merger, Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 01, 2021
Aug. 21, 2019
Aug. 01, 2019
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2021
Jul. 31, 2020
Statement [Line Items]                
Impairment of assets held-for-sale         $ 52      
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | HVAC Business                
Statement [Line Items]                
Loss on sale of business       $ 2        
Jointly Owned Electricity Generation Plant                
Statement [Line Items]                
Proportionate ownership share, percent (as a percentage)               5.97%
Mountaineer                
Statement [Line Items]                
Total purchase price $ 540              
Liabilities incurred $ 140              
Transaction costs             $ 13  
Merger Sub                
Statement [Line Items]                
Total purchase price   $ 2,228            
Transaction costs   8            
Total cash paid   529            
Operating expenses   $ 6            
Deferred tax asset, step up in tax basis of the underlying assets           $ 512    
Merger Sub | Common Stock                
Statement [Line Items]                
Consideration paid (in shares)   34,612,847       34,613,000    
Merger Sub | Merger Agreement, Proposed Consideration One | Common Stock                
Statement [Line Items]                
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares)   0.6378            
Merger Sub | Merger Agreement, Proposed Consideration Two | Common Stock                
Statement [Line Items]                
Business combination, consideration transferred, equity interests issuable per acquiree share (in shares)   0.500            
Merger Sub | Merger Agreement, Proposed Consideration Two | Cash Without Interest                
Statement [Line Items]                
Business combination, consideration transferred, equity interests issuable per share (in dollars per share)   $ 7.63            
Merger Sub | Merger Agreement, Proposed Consideration Three | Cash Without Interest                
Statement [Line Items]                
Business combination, consideration transferred, equity interests issuable per share (in dollars per share)   $ 35.325            
Pennant | Affiliated Entity | CMG                
Statement [Line Items]                
Percentage of voting interests acquired (as a percentage)     47.00%          
CMG                
Statement [Line Items]                
Transaction costs           $ 15    
Total cash paid     $ 1,284