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Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

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		2018		2017
Regulatory assets
Deferred income tax regulatory assets	$	775	$	667
Pension and post-retirement medical plan (1)		453		380
Cost recovery clauses		75		17
Environmental remediations		31		41
Hurricane Matthew restoration		28		28
Stranded cost recovery		28		25
Unamortized defeasance costs		26		32
Demand side management ("DSM") deferral		24		28
Deferrals related to derivative instruments		10		15
Storm reserve		4		59
Other		115		119
	$	1,569	$	1,411
Current	$	165	$	138
Long-term		1,404		1,273
Total regulatory assets	$	1,569	$	1,411
Regulatory liabilities
Deferred income tax regulatory liabilities		1,218		1,116
Accumulated reserve - cost of removal		955		894
Regulated fuel adjustment mechanism		161		177
Deferrals related to derivative instruments		116		182
Storm reserve		76		-
Cost recovery clauses		30		51
Self-insurance fund (note 31)		30		28
Other		24		20
	$	2,610	$	2,468
Current	$	251	$	226
Long-term		2,359		2,242
Total regulatory liabilities	$	2,610	$	2,468
(1) The December 31, 2017 pension and post-retirement medical plan regulatory asset includes a prior period reclassification of $35 million from AOCI, for changes in unrecognized pension and post-retirement benefit costs to be consistent with current year presentation. Refer to note 10 for further details.