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Income Taxes (Deferred) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Components of Deferred Tax Assets [Abstract]    
Deferred Tax Assets, Tax Loss Carry Forwards $ 853 $ 1,036
Tax credit carry forwards 314 318
Regulatory liabilities - cost of removal 208 388
Deferred Tax Assets, Derivative Instruments 107 150
Pension and post-retirement liabilities 124 153
Deferred Tax Assets, Other 394 490
Deferred Tax Assets, Gross, Total 2,000 2,535
Deferred Tax Assets, Valuation Allowance (105) (58)
Deferred Tax Assets, Net of Valuation Allowance, Total 1,895 2,477
Components of Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (2,321) (3,553)
Deferred Tax Liabilities, Derivatives (155) (202)
Deferred Tax Liabilities, Other (292) (269)
Deferred Tax Liabilities, Gross, Total (2,768) (4,024)
Noncurrent Deferred Tax Liabilities And Assets [Abstract]    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 138 125
Deferred Tax Liabilities, Net, Noncurrent (1,011) (1,672)
Deferred Tax Assets (Liabilities), Net, Noncurrent, Total $ (873) $ (1,547)