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Asset Retirement Obligations - Additional Information (Details) - Asset retirement obligation - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of other provisions [line items]      
Estimated cash flows, undiscounted amount $ 721,700 $ 721,000  
Estimated inflation rate 1.80% 1.50%  
Estimated risk free rate 1.70% 1.20%  
Other provisions $ 743,683 $ 760,383 $ 667,974
Other provisions, period of costs being incurred 60 years