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Impairment Charges and Reversals - Sensitivity (Details) $ in Millions | 12 Months Ended
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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)

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