Net volumes related to price risk management activities (Details) MWh in Millions, MMBTU in Millions, $ in Millions |
Dec. 31, 2020
CAD ($)
MWh
MMBTU
|
Dec. 31, 2019
CAD ($)
MWh
MMBTU
|
---|---|---|
Price Risk Management [Abstract] | ||
Electricity | MWh | 6 | 6 |
Natural gas | MMBTU | 137 | 145 |
Foreign currency exchange | $ | $ 19 | $ 23 |