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Employee Future Benefits - Components Recognized in OCI and Regulatory Assets (Details) - CAD CAD in Millions | 12 Months Ended
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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 |

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- Definition Regulatory Assets, Amortization Adjustment, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit) + References No definition available. + Details
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