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Risk Management Activities - Hedging Instruments (Details)
$ in Thousands, $ in Thousands, $ in Millions, kJ in Billions
 12 Months Ended
Dec. 31, 2019
CAD ($)
MWh
Dec. 31, 2018
CAD ($)
MWh
Dec. 31, 2017
CAD ($)
Dec. 31, 2019
J
Dec. 31, 2019
kJ
Dec. 31, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
J
Dec. 31, 2018
kJ
Dec. 31, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
AUD ($)
Disclosure of detailed information about financial instruments [line items]                              
Collateral paid (Note 15)               $ 42,000           $ 105,000  
Notional amount               3,104,000           3,234,000  
Hedging instrument, assets               7,000           10,000  
Unrealized pre-tax gains (losses) $ 1,000 $ 4,000 $ 2,000                        
Borrowings subject to floating interest rates           11.00%           14.00%      
Gains (losses) on exchange differences on translation, net of tax $ (38,000) $ 43,000                          
Electricity | Non-Hedges | Commodity risk management                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold | MWh 16,097,000 58,885,000                          
Notional amount purchased | MWh 7,204,000 37,023,000                          
Electricity | Cash flow hedges | Commodity risk management                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold | MWh 222,000 2,128,000                          
Notional amount purchased | MWh 0 0                          
Long-term debt | Net investment hedges                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount             $ 370,000           $ 400,000    
Long-term debt | Fair value hedges | Interest rate risk                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount             50,000           50,000    
Physical power sales | Cash flow hedges | Commodity risk management                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount             400                
Hedging instrument, assets               678,000           687,000  
Notional amount purchased | MWh 23,000                            
Gain (loss) on hedge ineffectiveness $ 47,000 $ 60,000                          
Reserve of cash flow hedges               527,000           508,000  
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Hedging instrument, assets                           (7,000)  
Hedging instrument, liabilities               0           5,000  
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Cash flow hedges | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold               124,000           0  
Derivative, Notional Amount Purchased             95,000           0    
Foreign Exchange Forward Contracts, Foreign-Denominated Debt [Member] | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold               191,000           124,000  
Derivative, Notional Amount Purchased             150,000           100    
Hedging instrument, assets               6,000              
Hedging instrument, liabilities                           (10,000)  
Natural gas | Non-Hedges | Commodity risk management                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold       38,062,000 80,413         80,413,000 74,194        
Notional amount purchased       55,023,000 110,488         110,488,000 103,805        
Transmission | Non-Hedges | Commodity risk management                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold | MWh 0 29,000                          
Notional amount purchased | MWh 1,818,000 11,163,000                          
Foreign-denominated debt | Net Investment Hedge | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Hedging instrument, assets               483,000           546  
Gain (loss) on hedge ineffectiveness $ 21,000 $ (41,000)                          
Minimum | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Derivative, Notional Amount Purchased               139,000           205,000  
Maximum | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Derivative, Notional Amount Purchased               266,000           $ 214,000  
Hedging instrument, liabilities               $ 4,000              
U.S. Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold             $ 108,000           $ 164,000    
Australia, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Notional amount sold                 $ 286           $ 218
Reserve of exchange differences on translation                              
Disclosure of detailed information about financial instruments [line items]                              
Gains (losses) on exchange differences on translation, net of tax $ 59,000 $ (84,000)