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Employee Benefit Plans (AOCI ) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses $ (284) $ (330)
Past service (gains) (3) (3)
Regulatory Assets 282 309
Accumulated Other Comprehensive Income (Loss), before Tax, Total 563 636
Deferred Tax Assets, Defined Benefit Plan (15) (16)
Net amount in AOCI after tax adjustment 548 620
Non-pension Benefit Plans [Member    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses (11) (15)
Past service (gains) (11) (19)
Regulatory Assets 74 48
Accumulated Other Comprehensive Income (Loss), before Tax, Total 74 44
Deferred Tax Assets, Defined Benefit Plan (1) 1
Net amount in AOCI after tax adjustment $ 73 $ 45