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Income Taxes - Components of Income Tax Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disposal Groups, Including Discontinued Operations [Line Items]      
Current income tax expense(1) $ 35 $ 28 $ 79
Deferred income tax expense (recovery) related to the origination and reversal of temporary differences 22 (61) (110)
Deferred income tax expense resulting from changes in tax rates or laws (31) 0 110
Writedown (reversal of writedown) of deferred income tax assets (9) 27 (15)
Current income tax expense 35 28 79
Deferred income tax recovery (18) (34) (15)
Income tax expense (recovery) 17 $ (6) $ 64
Net deferred tax assets 6    
Tax Cuts and Jobs Act of 2017, change in rage, deferred tax asset, income tax expense (benefit) 104    
Tax Cuts and Jobs Act of 2017, change in tax Rate, deferred tax liability, income tax (expense) benefit 110    
Deferred tax expense (income) recognised in profit or loss 1    
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax recovery $ 111    
Corporate tax rate 26.50% 26.80% 26.80%
Solomon Power Station      
Disposal Groups, Including Discontinued Operations [Line Items]      
Current income tax expense(1)     $ 56