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Employee Benefit Plans (Changes in Benefit Obligation and Plan Aassets and the Funded Status) (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance CAD 1,301  
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,208 CAD 1,301
Pension Plan [Member]    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Defined Benefit Plan, Benefit Obligation, Beginning Balance 1,520 1,470
Addition of Teco 1,035 0
Defined Benefit Plan, Service Cost 35 22
Defined Benefit Plan, Contributions by Plan Participants 8 8
Defined Benefit Plan, Interest Cost 79 59
Defined Benefit Plan, Plan Amendments 0 0
Benefits Paid (94) (61)
Defined Benefit Plan, Actuarial Gain (Loss) (2) (15)
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) 26 37
Defined Benefit Plan, Benefit Obligation, Ending Balance 2,607 1,520
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 1,300 1,205
Addition of Teco 830 0
Defined Benefit Plan, Contributions by Employer 49 23
Defined Benefit Plan, Contributions by Plan Participants 8 8
Benefits Paid (94) (61)
Defined Benefit Plan, Actual Return on Plan Assets 93 96
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 22 29
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 2,208 1,300
Defined Benefit Plan, Funded Status of Plan [Abstract]    
Defined Benefit Plan, Funded Status of Plan (399) (220)
Non-pension Benefit Plans [Member    
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Defined Benefit Plan, Benefit Obligation, Beginning Balance 88 102
Addition of Teco 277 0
Defined Benefit Plan, Service Cost 4 3
Defined Benefit Plan, Contributions by Plan Participants 0 0
Defined Benefit Plan, Interest Cost 9 4
Defined Benefit Plan, Plan Amendments 2 (27)
Benefits Paid (16) (6)
Defined Benefit Plan, Actuarial Gain (Loss) (12) 1
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss) 6 11
Defined Benefit Plan, Benefit Obligation, Ending Balance 358 88
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Defined Benefit Plan, Fair Value of Plan Assets, Beginning Balance 6 5
Addition of Teco 29 0
Defined Benefit Plan, Contributions by Employer 17 6
Defined Benefit Plan, Contributions by Plan Participants 0 0
Benefits Paid (16) (6)
Defined Benefit Plan, Actual Return on Plan Assets 2 0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets 1 1
Defined Benefit Plan, Fair Value of Plan Assets, Ending Balance 39 6
Defined Benefit Plan, Funded Status of Plan [Abstract]    
Defined Benefit Plan, Funded Status of Plan CAD (319) CAD (82)