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Employee Benefit Plans (AOCI ) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses $ (246) $ (251)
Past service (gains) (2) (3)
Regulatory Assets 389 315
Accumulated Other Comprehensive Income (Loss), before Tax, Total 633 563
Deferred Tax Assets, Defined Benefit Plan (5) (2)
Net amount in AOCI after tax adjustment 628 561
Non-pension Benefit Plans [Member    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses 7 4
Past service (gains) 0 0
Regulatory Assets 65 78
Accumulated Other Comprehensive Income (Loss), before Tax, Total 58 74
Deferred Tax Assets, Defined Benefit Plan 2 0
Net amount in AOCI after tax adjustment $ 60 $ 74