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Provisions - Sensitivities (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Provisions    
Percentage change in discount rate used to arrive at provision for decommissioning, restoration and rehabilitation costs 1.00% 1.00%
1% Increase $ (1,594) $ (1,497)
1% Decrease $ 2,131 $ 2,113