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Employee Benefit Plans (AOCI ) (Details) - CAD
CAD in Millions
Dec. 31, 2016
Dec. 31, 2015
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses CAD (330) CAD (353)
Past service (gains) (3) (4)
Regulatory Assets 309 0
Accumulated Other Comprehensive Income (Loss), before Tax, Total 636 349
Deferred Tax Assets, Defined Benefit Plan (16) (19)
Net amount in AOCI after tax adjustment 620 330
Non-pension Benefit Plans [Member    
Defined Benefit Plan Disclosure [Line Items]    
Actuarial losses (15) (15)
Past service (gains) (19) (27)
Regulatory Assets 48 0
Accumulated Other Comprehensive Income (Loss), before Tax, Total 44 (12)
Deferred Tax Assets, Defined Benefit Plan 1 3
Net amount in AOCI after tax adjustment CAD 45 CAD (9)