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Regulatory Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
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 |  | 2017 |  | 2016
Regulatory assets |  |  |  |
Deferred income tax regulatory assets | $ | 667 | $ | 632
Pension and post-retirement medical plan |  | 345 |  | 373
Storm reserve |  | 59 |  | -
Environmental remediations |  | 41 |  | 49
Unamortized defeasance costs |  | 32 |  | 39
2015 demand side management ("DSM") deferral |  | 28 |  | 32
GBPC Hurricane Matthew restoration |  | 28 |  | 28
Stranded cost recovery |  | 25 |  | 27
Cost-recovery clauses |  | 17 |  | 12
Deferrals related to derivative instruments |  | 15 |  | 15
Debt basis adjustment |  | 13 |  | 19
Deferred bond refinancing costs |  | 7 |  | 9
Other |  | 99 |  | 87
| $ | 1,376 | $ | 1,322
Current | $ | 138 | $ | 80
Long-term |  | 1,238 |  | 1,242
Total regulatory assets | $ | 1,376 | $ | 1,322
Regulatory liabilities |  |  |  |
Deferred income tax regulatory liabilities |  | 1,116 |  | 26
Accumulated reserve - cost of remova l |  | 894 |  | 990
Deferrals related to derivative instruments |  | 182 |  | 230
Regulated fuel adjustment mechanism |  | 177 |  | 94
Cost-recovery clauses |  | 51 |  | 153
Self-insurance fund (notes 7 and 32) |  | 28 |  | 30
Bill reduction credit |  | 4 |  | 10
Storm reserve |  | - |  | 75
Other |  | 16 |  | 31
| $ | 2,468 | $ | 1,639
Current | $ | 226 | $ | 362
Long-term |  | 2,242 |  | 1,277
Total regulatory liabilities | $ | 2,468 | $ | 1,639
Fuel Adjustment Mechanism [Table Text Block] |
For the |  | Year ended December 31
millions of Canadian dollars |  | 2017 |  | 2016
(Over) under recovery of current period Fuel costs | $ | - | $ | 29
Recovery from customers of prior years’ Fuel costs |  | - |  | 12
Application of non-fuel revenues |  | - |  | 20
Regulated fuel adjustment mechanism | $ | - | $ | 61
Schedule of Regulatory Assets [Table Text Block] |
millions of Canadian dollars |  | 2017 |  | 2016
FAM regulatory asset – Balance as at January 1 | $ | (94) | $ | (28)
Under (over) recovery of current year Fuel Costs |  | (29) |  | (29)
Rebate to (recovery from) customers of prior years’ Fuel Costs |  | (12) |  | (12)
FAM audit disallowance, including interest adjustment |  | - |  | -
Excess non-fuel revenues |  | (5) |  | (27)
Interest on FAM balance |  | (5) |  | 1
FAM regulatory asset (liability) – Balance as at December 31 | $ | (160) | $ | (113)

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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