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Cash Flow Information Changes in Liabilities from Financing Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance at beginning of the period $ 4,476 $ 4,064  
Cash issuances 39 981  
Repayments and dividends paid (329) (727)  
New leases 5 40  
Dividends declared 116 103  
Foreign exchange impact (36) 39  
Other (9) (24)  
Balance at end of the period 4,262 4,476 $ 4,064
Net increase (decrease) in borrowings under credit facilities (46) 449 (114)
Issuance of long-term debt 39 532 173
Repayment of long-term debt (164) (621) (92)
Decrease in lease liabilities (10) (9) (8)
Long-term debt and lease liabilities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance at beginning of the period 3,669 3,267  
Cash issuances 39 981  
Repayments and dividends paid (220) (630)  
New leases 5 40  
Dividends declared 0 0  
Foreign exchange impact (36) 39  
Other 12 (28)  
Balance at end of the period 3,469 3,669 3,267
Exchangeable securities      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance at beginning of the period 739 735  
Cash issuances 0 0  
Repayments and dividends paid 0 0  
New leases 0 0  
Dividends declared 0 0  
Foreign exchange impact 0 0  
Other 5 4  
Balance at end of the period 744 739 735
Dividends payable (common and preferred)      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance at beginning of the period 68 62  
Cash issuances 0 0  
Repayments and dividends paid (109) (97)  
New leases 0 0  
Dividends declared 116 103  
Foreign exchange impact 0 0  
Other (26) 0  
Balance at end of the period $ 49 $ 68 $ 62