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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows 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]      
Lease Liabilities, Beginning of Year $ 2,957 $ 1,757  
Changes From Financing Cash Flows:      
Issuance of Long-Term Debt 0 1,557 $ 1,326
(Repayment) of Long-Term Debt (4,149) (2,870) (112)
Principal Repayment of Leases (302) (300) (197)
Non-Cash Changes:      
Lease Additions 25 110  
Lease Modifications 83 22  
Lease Termination (5) (1)  
Other inflows (outflows) of cash, classified as financing activities 2 0 0
Lease Liabilities, End of Year 2,836 2,957 1,757
Common shares      
Changes From Financing Cash Flows:      
Variable dividends paid on common shares 219 0 0
Dividends Payable      
Non-Cash Changes:      
Ending balance, debt 9    
Dividends Payable | Common shares      
Changes From Financing Cash Flows:      
Dividends paid (682) (176) (77)
Variable dividends paid on common shares (219)    
Non-Cash Changes:      
Base Dividends Declared on Common Shares 682 176 77
Dividends Payable | Preference shares      
Changes From Financing Cash Flows:      
Dividends paid (26) (34)  
Non-Cash Changes:      
Base Dividends Declared on Common Shares 35 34  
Short-Term Borrowings      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, debt 79 121  
Changes From Financing Cash Flows:      
Net Issuance (Repayment) of Short-Term Borrowings 34 (77) 117
Acquisition (Note 5)   40  
Non-Cash Changes:      
Exchange Rate Movements and Other 2 (5) 4
Ending balance, debt 115 79 121
Long-Term Debt      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance, debt 12,385 7,441 6,699
Changes From Financing Cash Flows:      
(Repayment) of Revolving Long-Term Debt   (350) (220)
Issuance of Long-Term Debt   1,557 1,326
(Repayment) of Long-Term Debt (4,149) (2,870) (112)
Acquisition (Note 5)   6,602  
Non-Cash Changes:      
Net Premium (Discount) on Redemption of Long-Term Debt (29) 121 (25)
Finance Costs (28) (59) 5
Exchange Rate Movements and Other 512 (57) (232)
Ending balance, debt 8,691 12,385 7,441
Lease Liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Lease Liabilities, Beginning of Year 2,957 1,757 1,916
Changes From Financing Cash Flows:      
Principal Repayment of Leases (302) (300) (197)
Acquisition (Note 5)   1,441  
Non-Cash Changes:      
Lease Additions 25 110 49
Lease Modifications 83 22 (2)
Lease Re-measurements 7 (4) (2)
Lease Termination (5) (1) (1)
Exchange Rate Movements and Other 71 (10) (6)
Transfers to liabilities related to assets held for sale   (58)  
Lease Liabilities, End of Year $ 2,836 $ 2,957 $ 1,757