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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Regulatory Assets and Liabilities Disclosure [Abstract] |
Schedule Of Regulatory Assets and Liabilities [Table Text Block] |
As at |  | December 31 |  | December 31
millions of Canadian dollars |  | 2016 |  | 2015
Regulatory assets |  |  |  |
Deferred income tax regulatory assets | $ | 632 | $ | 431
Pension and post-retirement medical plan |  | 373 |  | 12
Environmental remediations |  | 49 |  | -
Unamortized defeasance costs |  | 39 |  | 46
2015 demand side management deferral |  | 32 |  | 36
GBPC Hurricane Matthew restoration |  | 28 |  | -
Stranded cost recovery |  | 27 |  | 28
Debt basis adjustment |  | 19 |  | -
Deferrals related to derivative instruments |  | 15 |  | 68
Cost-recovery clauses |  | 12 |  | -
Deferred bond refinancing costs |  | 9 |  | -
Regulated fuel adjustment mechanism |  | - |  | 14
Other |  | 87 |  | 64
| $ | 1,322 | $ | 699
Current | $ | 80 | $ | 94
Long-term |  | 1,242 |  | 605
Total regulatory assets | $ | 1,322 | $ | 699
Regulatory liabilities |  |  |  |
Accumulated reserve - cost of remova l |  | 990 |  | 94
Deferrals related to derivative instruments |  | 230 | $ | 210
Cost-recovery clauses |  | 153 |  | -
Regulated fuel adjustment mechanism |  | 94 |  | 42
Transmission and delivery storm reserve |  | 75 |  | -
Self-insurance fund (notes 7 and 33) |  | 30 |  | 87
Deferred income tax regulatory liabilities |  | 26 |  | 18
Bill reduction credit (note 4) |  | 10 |  | -
Other |  | 31 |  | 14
| $ | 1,639 | $ | 465
Current | $ | 362 | $ | 112
Long-term |  | 1,277 |  | 353
Total regulatory liabilities | $ | 1,639 | $ | 465
Fuel Adjustment Mechanism [Table Text Block] |
For the |  | Year ended December 31
millions of Canadian dollars |  | 2016 |  | 2015
(Over) under recovery of current period Fuel costs | $ | 29 | $ | (24)
Recovery from customers of prior years’ Fuel costs |  | 12 |  | 56
Application of non-fuel revenues |  | 20 |  | 45
Regulated fixed cost deferral related to 2015 demand side management |  | - |  | (35)
Regulated fuel adjustment mechanism | $ | 61 | $ | 42

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