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 |