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Risk Management Activities - Effect on Cash Flow Hedges (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax $ 77 $ (9) $ 136
Other comprehensive income that will be reclassified to profit or loss, net of tax (19) (11) 82
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (53) (57) (138)
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0 0
Accumulated other comprehensive income (Note 26) 454 481  
Reserve of exchange differences on translation      
Disclosure of detailed information about financial instruments [line items]      
Accumulated other comprehensive income (Note 26) (21) 17 (26)
Commodity contracts      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax 77 (9) 163
Foreign exchange forwards on project hedges      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax     (1)
Foreign exchange forwards on US debt      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax   0 0
Cross-currency swaps      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax     (26)
Forward starting interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Gains (losses) on cash flow hedges, before tax 0 0 0
Revenue | Commodity contracts      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income (59) (67) (172)
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0 0
Property, plant and equipment | Foreign exchange forwards on project hedges      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income     0
Gain (loss) on hedge ineffectiveness recognised in profit or loss     0
Profit (Loss)      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in profit or loss     31
Interest expense | Forward starting interest rate swaps      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income 6 7 7
Gain (loss) on hedge ineffectiveness recognised in profit or loss 0 0 0
Foreign exchange (gain) loss      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in profit or loss     15
Foreign exchange (gain) loss | Foreign exchange forwards on US debt      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income   3 3
Gain (loss) on hedge ineffectiveness recognised in profit or loss   $ 0 0
Foreign exchange (gain) loss | Cross-currency swaps      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income     24
Gain (loss) on hedge ineffectiveness recognised in profit or loss     $ 0
Scenario, Forecast      
Disclosure of detailed information about financial instruments [line items]      
Other comprehensive income that will be reclassified to profit or loss, net of tax $ 68