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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail)
Jun. 30, 2022
MMBTU
Derivative [Line Items]  
Commodity volumes, gas 2,995,579
Financial contracts: Swaps  
Derivative [Line Items]  
Commodity volumes, gas 2,882,075
Options  
Derivative [Line Items]  
Commodity volumes, gas 113,504