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Risk Management Activities - Non-Hedges (Details)
t in Thousands, $ in Millions, kJ in Billions
 12 Months Ended
Dec. 31, 2018
CAD ($)
MWh
kJ
t
Dec. 31, 2017
CAD ($)
MWh
kJ
t
Dec. 31, 2016
CAD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Foreign exchange gain (loss) $ (15) $ (1) $ (5)
Gains (losses) on change in fair value of derivatives 29 45 63
Gains on change in fair value of derivatives 3 28 9
Unrealised Loss On Change In Fair Value Of Derivatives 4 (2) 4
Unrealised Gains On Change In Fair Value Of Derivatives $ (1) $ 30 $ 5
Electricity | Non-Hedges | Commodity risk management      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Notional amount sold | MWh 58,885,000 14,688,000  
Notional amount purchased | MWh 37,023,000 7,348,000  
Natural gas | Non-Hedges | Commodity risk management      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Notional amount sold | kJ 80,413 74,194  
Notional amount purchased | kJ 110,488 103,805  
Transmission | Non-Hedges | Commodity risk management      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Notional amount sold | MWh 29,000 1,000  
Notional amount purchased | MWh 11,163,000 3,455,000  
Emissions | Non-Hedges | Commodity risk management      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative, Nonmonetary Notional Amount Sold, Emissions | t 3,134 516  
Derivative, Nonmonetary Notional Amount Purchased, Emissions | t 2,948 717