XML 116 R76.htm IDEA: XBRL DOCUMENT v3.20.4
financial instruments - Contract assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit risk      
Contract assets $ 850 $ 1,238 $ 1,475
Cost/Gross amount      
Credit risk      
Contract assets 892 1,295  
Allowance for doubtful accounts      
Credit risk      
Contract assets (42) (57)  
The 12-month period ending one year hence      
Credit risk      
Contract assets 582 910  
The 12-month period ending one year hence | Cost/Gross amount      
Credit risk      
Contract assets 611 952  
The 12-month period ending one year hence | Allowance for doubtful accounts      
Credit risk      
Contract assets (29) (42)  
The 12-month period ending two years hence      
Credit risk      
Contract assets 253 308  
The 12-month period ending two years hence | Cost/Gross amount      
Credit risk      
Contract assets 265 322  
The 12-month period ending two years hence | Allowance for doubtful accounts      
Credit risk      
Contract assets (12) (14)  
Thereafter      
Credit risk      
Contract assets 15 20  
Thereafter | Cost/Gross amount      
Credit risk      
Contract assets 16 21  
Thereafter | Allowance for doubtful accounts      
Credit risk      
Contract assets $ (1) $ (1)