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Long term debt - Schedules (Narrative) (Details)
 12 Months Ended
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Revolving Credit Facilities [Abstract]    
Gross Unsecured Revolving Credit Facility Available $ 1,000,000,000  
Maximum Letters of credit under the facility 100,000,000  
Increase in revolving credit facility with minimum Increments 50,000,000  
Maximum unsecured revolving credit facility 1,250,000,000  
Unsecured loans received 0  
Outstanding letters of credit facility 1,593,379,000 $ 1,573,873,000
Gross Letters Of Credit Committments $ 1,756,754,000 $ 1,696,041,000
Debt to tangible net worth ratio 1  
Credit Facility Maturity October 1, 2026