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Income Taxes (Deferred) (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Components of Deferred Tax Assets [Abstract]    
Deferred Tax Assets, Tax Loss Carry Forwards CAD 1,036 CAD 72
Tax credit carry forwards 318 7
Regulatory liabilities - cost of removal 388 42
Deferred Tax Assets, Derivative Instruments 173 204
Pension and post-retirement liabilities 147 129
Regulatory liabilities 101 94
Asset retirement obligations 47 47
Deferred Tax Assets, Goodwill and Intangible Assets 0 0
Deferred Tax Assets, Other 355 136
Deferred Tax Assets, Gross, Total 2,565 731
Deferred Tax Assets, Valuation Allowance (58) (18)
Deferred Tax Assets, Net of Valuation Allowance, Total 2,507 713
Components of Deferred Tax Liabilities [Abstract]    
Deferred Tax Liabilities, Property, Plant and Equipment (3,625) (960)
Deferred Tax Liabilities, Derivatives (202) (264)
Deferred Tax Liabilities, Leasing Arrangements (103) (89)
Deferred Tax Liabilities, Other (124) (130)
Deferred Tax Liabilities, Gross, Total (4,054) (1,443)
Noncurrent Deferred Tax Liabilities And Assets [Abstract]    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 125 32
Deferred Tax Liabilities, Net, Noncurrent (1,672) (762)
Deferred Tax Assets (Liabilities), Net, Noncurrent, Total CAD (1,547) CAD (730)