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Income Taxes (Deferred) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Components of Deferred Tax Assets [Abstract]    
Deferred Tax Assets, Tax Loss Carry Forwards $ 917 $ 853
Tax credit carry forwards 269 314
Regulatory liabilities - cost of removal 206 208
Deferred Tax Assets, Derivative Instruments 90 107
Pension and post-retirement liabilities 126 112
Deferred Tax Assets, Other 441 394
Deferred Tax Assets, Gross, Total 2,049 1,988
Deferred Tax Assets, Valuation Allowance (163) (105)
Deferred Tax Assets, Net of Valuation Allowance, Total 1,886 1,883
Components of Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (2,591) (2,321)
Deferred Tax Liabilities, Derivatives (124) (155)
Deferred Tax Liabilities, Other (316) (292)
Deferred Tax Liabilities, Gross, Total (3,031) (2,768)
Noncurrent Deferred Tax Liabilities And Assets [Abstract]    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 175 138
Deferred Tax Liabilities, Net, Noncurrent (1,320) (1,023)
Deferred Tax Assets (Liabilities), Net, Noncurrent, Total $ (1,145) $ (885)