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Lawsuits, Claims, Commitments and Contingencies (Details)
$ in Millions
3 Months Ended
Sep. 30, 2021
USD ($)
MMBTU / d
$ / MMBtu
Jun. 30, 2021
USD ($)
MMBTU / d
Jun. 07, 2006
USD ($)
Long-term Purchase Commitment [Line Items]      
Commitments under contracts | $     $ 6
Long-term purchase commitment amount | $   $ 32  
Long-term purchase commitment, average price | $ / MMBtu 0.52    
Shipment Of Natural Gas, Beginning May 2022 Thru April 2032      
Long-term Purchase Commitment [Line Items]      
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d 32,700    
Long-term purchase commitment amount | $ $ 62    
Shipment Of Natural Gas, Beginning October 2021 Thru October 2036      
Long-term Purchase Commitment [Line Items]      
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d   10,000  
Shipment Of Natural Gas, Beginning November 2021 Thru December 2024      
Long-term Purchase Commitment [Line Items]      
Long-term purchase commitment amount (in mmbtu/d) | MMBTU / d   5,500