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Risk Management Activities - Non-Hedges (Details)
$ in Millions, kJ in Billions
 12 Months Ended
Dec. 31, 2019
CAD ($)
MWh
Dec. 31, 2018
CAD ($)
MWh
Dec. 31, 2017
CAD ($)
Dec. 31, 2019
kJ
Dec. 31, 2019
t
Dec. 31, 2019
J
Dec. 31, 2019
MW
Dec. 31, 2018
kJ
Dec. 31, 2018
t
Dec. 31, 2018
J
Dec. 31, 2018
MW
Disclosure of nature and extent of risks arising from financial instruments [line items]                      
Gains (losses) on change in fair value of derivatives | $ $ 33 $ 29 $ 45                
Gains on change in fair value of derivatives | $ 24 3 28                
Unrealised Loss On Change In Fair Value Of Derivatives | $ 6 4 (2)                
Unrealised Gains On Change In Fair Value Of Derivatives | $ $ 18 $ (1) $ 30                
Electricity | Non-Hedges | Commodity risk management                      
Disclosure of nature and extent of risks arising from financial instruments [line items]                      
Notional amount sold | MWh 16,097,000 58,885,000                  
Notional amount purchased | MWh 7,204,000 37,023,000                  
Natural gas | Non-Hedges | Commodity risk management                      
Disclosure of nature and extent of risks arising from financial instruments [line items]                      
Notional amount sold       80,413   38,062,000   74,194   80,413,000  
Notional amount purchased       110,488   55,023,000   103,805   110,488,000  
Transmission | Non-Hedges | Commodity risk management                      
Disclosure of nature and extent of risks arising from financial instruments [line items]                      
Notional amount sold | MWh 0 29,000                  
Notional amount purchased | MWh 1,818,000 11,163,000                  
Emissions | Non-Hedges | Commodity risk management                      
Disclosure of nature and extent of risks arising from financial instruments [line items]                      
Notional amount sold | MW             184,000       0
Notional amount purchased | MW             138,000       0
Notional amount sold | t         2,436,000       3,134,000    
Notional amount purchased | t         2,446,000       2,948,000