XML 143 R79.htm IDEA: XBRL DOCUMENT v3.20.4
Long term debt - Schedules (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Nov. 20, 2020
CAD ($)
Oct. 21, 2020
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Proceeds of long-term debt $ 397,539,000 $ 0    
Redemption of Series E debentures 24,439,000 0    
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 1,596,488,000 1,528,603,000    
Gross Letters Of Credit Committments $ 1,698,340,000 $ 1,719,120,000    
Debt to tangible net worth ratio 1      
Credit Facility Maturity November 1, 2023      
Series E [Member]        
Disclosure of detailed information about borrowings [line items]        
Stated interest rates on debentures 3.75%      
Unsecured debentures redeemed, principal amount     $ 400,000,000  
Redemption of Series E debentures $ 24,439,000      
Series H [Member]        
Disclosure of detailed information about borrowings [line items]        
Unsecured debentures issued, principal amount       $ 400,000,000
Stated interest rates on debentures 2.95%     2.95%
Proceeds of long-term debt $ 397,500,000      
Effective interest rate       3.05%