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Employee Benefit Plans (Net amount in AOCI and regulatory assets) (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Regulatory assets | $ 1,552 | $ 1,569
Defined benefit pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | 160 | 246
Past service (gains) | (1) | (2)
Regulatory assets | 358 | 389
Accumulated Other Comprehensive Income (Loss), before Tax, Total | 517 | 633
Amount included in deferred income tax |  | 7
Amount included in deferred income tax | (5) |
Net amount in AOCI after tax adjustment | 524 | 628
Non-pension Benefit Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | (5) | (7)
Past service (gains) | 0 | 0
Regulatory assets | 78 | 65
Accumulated Other Comprehensive Income (Loss), before Tax, Total | 73 | 58
Amount included in deferred income tax | 2 |
Amount included in deferred income tax |  | (1)
Net amount in AOCI after tax adjustment | $ 72 | $ 60

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