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Inventory - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
CAD ($)
emissionCredit
$ / t
Dec. 31, 2022
CAD ($)
emissionCredit
$ / t
Analysis of income and expenses [Line Items]    
Emission credits | emissionCredit 962,548 963,068
Purchased emission credits $ 45 $ 27
Emission credits in inventory | emissionCredit 3,121,837 3,619,450
Carbon compliance obligation, settlement amount | $ / t 65 50
Emission credits utilized | emissionCredit   1,169,333
Carrying value   $ 35
Carbon compliance obligation settlement   47
Carbon compliance costs   $ 12