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Regulatory Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Regulatory Assets and Liabilities Disclosure [Abstract]  
Schedule Of Regulatory Assets and Liabilities [Table Text Block]
As atDecember 31December 31
millions of Canadian dollars 20172016
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 removal 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 theYear ended December 31
millions of Canadian dollars20172016
(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 dollars20172016
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)