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Supplemental Disclosure of Cash Flow Information - Liabilities Arising From Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance $ 16,159 $ 23,115  
Changes from financing cash flows:      
Issue (repayment) of long-term debt (4,010) (6,779)  
Repayment of long-term debt 0 (183) $ (397)
Proceeds on settlement of cross currency swap 69 0 166
Payment of lease liabilities (232) (209) (225)
Non-cash changes:      
Lease additions 182 88  
Changes in foreign exchange and fair value 817 (56)  
Liabilities arising from financing activities, ending balance 12,985 16,159 23,115
STORM Resources Ltd      
Changes from financing cash flows:      
Repayment of long-term debt   (183)  
Non-cash changes:      
Assumption of long-term debt   183  
Long-term debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 14,694 21,453  
Changes from financing cash flows:      
Issue (repayment) of long-term debt (4,010) (6,779)  
Non-cash changes:      
Changes in foreign exchange and fair value 761 20  
Liabilities arising from financing activities, ending balance 11,445 14,694 21,453
Long-term debt | STORM Resources Ltd      
Changes from financing cash flows:      
Repayment of long-term debt   (183)  
Non-cash changes:      
Assumption of long-term debt   183  
Cash flow hedges on US dollar debt securities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance (119) (28)  
Changes from financing cash flows:      
Proceeds on settlement of cross currency swap 69    
Non-cash changes:      
Changes in foreign exchange and fair value 50 (91)  
Liabilities arising from financing activities, ending balance 0 (119) (28)
Lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Liabilities arising from financing activities, beginning balance 1,584 1,690  
Changes from financing cash flows:      
Payment of lease liabilities (232) (209)  
Non-cash changes:      
Lease additions 182 88  
Changes in foreign exchange and fair value 6 15  
Liabilities arising from financing activities, ending balance $ 1,540 $ 1,584 $ 1,690