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Employee Future Benefits - Components Recognized in OCI and Regulatory Assets (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]    
Total recognized in comprehensive income CAD 1 CAD (1)
Defined Benefit Pension Plans    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]    
Current year net actuarial losses (gains) 4 0
Past service credits/plan amendments 0 0
Amortization of actuarial gains 0 1
Income tax recovery (1) 0
Total recognized in comprehensive income 3 1
Regulatory Assets, Pension and Other Postretirement Benefit Plans [Abstract]    
Assets assumed on acquisition 23 0
Current year net actuarial (gains) losses (1) 8
Past service credits/plan amendments (10) 0
Amortization of actuarial losses (47) (56)
Amortization of past service costs (1) (1)
Foreign currency translation impacts (9) 49
Regulatory adjustments (11) 5
Total recognized in regulatory assets (56) 5
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]    
Future amortization of loss from AOCI 1  
Defined Benefit Plan, Amount to be Amortized from Regulatory Asset Next Fiscal Year [ [Abstract]    
Future amortization of loss from regulatory asset 43  
Future amortization of prior service credit from regulatory asset 1  
Future amorization of regulatory adjustments from regulatory asset 2  
OPEB Plans    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]    
Current year net actuarial losses (gains) (2) (1)
Past service credits/plan amendments 0 (1)
Amortization of actuarial gains 0 0
Income tax recovery 0 0
Total recognized in comprehensive income (2) (2)
Regulatory Assets, Pension and Other Postretirement Benefit Plans [Abstract]    
Assets assumed on acquisition 3 0
Current year net actuarial (gains) losses 0 (28)
Past service credits/plan amendments 0 (10)
Amortization of actuarial losses (4) (5)
Amortization of past service costs 13 (2)
Foreign currency translation impacts 1 (6)
Regulatory adjustments (6) 7
Total recognized in regulatory assets 7 CAD (44)
Defined Benefit Plan, Amount to be Amortized from Regulatory Asset Next Fiscal Year [ [Abstract]    
Future amortization of loss from regulatory asset 1  
Future amortization of prior service credit from regulatory asset 10  
Future amorization of regulatory adjustments from regulatory asset CAD 8