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Impairment Charges and Reversals - Sensitivity (Details)
$ in Millions
12 Months Ended
Dec. 31, 2022
CAD ($)
Disclosure of impairment loss recognised or reversed for cash-generating unit [abstract]  
Increase through change in discount rate, impairments $ 69
Decrease through change in discount rate, impairments (65)
Five percent increase through change in forward price estimates, Impairments (268)
Five percent decrease through change in forward price estimates, Impairments 268
One percent increase through change in discount rate, impairment reversal (72)
One percent decrease through change in discount rate, impairment reversal 14
Five percent increase through change in forward price estimates, impairment reversal 168
Five percent decrease through change in forward price estimates, impairment reversal $ (342)