XML 69 R58.htm IDEA: XBRL DOCUMENT v3.22.2
Contingencies - Environmental Liabilities (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Site Contingency [Line Items]          
Total amount provided for provisions for environmental remediation costs $ 81   $ 81   $ 79
Term for expected payments to be made     10 years    
Purchased services and other          
Site Contingency [Line Items]          
Environmental remediation expense $ 2 $ 2 $ 4 $ 4