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REGULATORY MATTERS (Tables)
 12 Months Ended
Dec. 31, 2017
Regulated Operations [Abstract]  
Schedule of Regulatory Assets
Accounting for rate-regulated activities has resulted in the recognition of the following significant regulatory assets and liabilities:
December 31,
Recovery/Refund Period Ends
2017

2016

(millions of Canadian dollars)
 
 

 

Regulatory assets/(liabilities)
 
 

 

Liquids Pipelines
 
 

 

Deferred income taxes
Various
1,492

1,270

Tolling deferrals
2018
(34
)
(37
)
Recoverable income taxes
Through 2030
46

51

Pipeline future abandonment costs1
Various
(141
)
(88
)
Gas Transmission and Midstream
 
 
 
Deferred income taxes
Various
717

—

Regulatory liability related to income taxes2
Various
(1,078
)
—

Other
Various
(16
)
—

Gas Distribution
 
 
 
Deferred income taxes
Various
1,000

385

Purchased gas variance3
Various
51

5

Pension plans and OPEB4
Various
102

116

Constant dollar net salvage adjustment
2018
38

38

Future removal and site restoration reserves
Various
(1,066
)
(606
)
Site restoration clearance adjustment
Various
(31
)
(109
)
Other
Various
31

(4
)
1
Funds collected are included in Restricted long-term investments (Note 13).
2
Relates to the establishment of a regulatory liability as a result of the United States tax reform legislation dated December 22, 2017.
3
Purchase gas variance is the difference between the actual cost and the approved cost of natural gas reflected in rates. EGD and Union Gas have been granted OEB approval to refund this balance to, or to collect this balance from, customers on a rolling 12-month basis via the Quarterly Rate Adjustment Mechanism process.
4
The balances are excluded from the rate base and do not earn an ROE.
Schedule of Regulatory Liabilities
Accounting for rate-regulated activities has resulted in the recognition of the following significant regulatory assets and liabilities:
December 31,
Recovery/Refund Period Ends
2017

2016

(millions of Canadian dollars)
 
 

 

Regulatory assets/(liabilities)
 
 

 

Liquids Pipelines
 
 

 

Deferred income taxes
Various
1,492

1,270

Tolling deferrals
2018
(34
)
(37
)
Recoverable income taxes
Through 2030
46

51

Pipeline future abandonment costs1
Various
(141
)
(88
)
Gas Transmission and Midstream
 
 
 
Deferred income taxes
Various
717

—

Regulatory liability related to income taxes2
Various
(1,078
)
—

Other
Various
(16
)
—

Gas Distribution
 
 
 
Deferred income taxes
Various
1,000

385

Purchased gas variance3
Various
51

5

Pension plans and OPEB4
Various
102

116

Constant dollar net salvage adjustment
2018
38

38

Future removal and site restoration reserves
Various
(1,066
)
(606
)
Site restoration clearance adjustment
Various
(31
)
(109
)
Other
Various
31

(4
)
1
Funds collected are included in Restricted long-term investments (Note 13).
2
Relates to the establishment of a regulatory liability as a result of the United States tax reform legislation dated December 22, 2017.
3
Purchase gas variance is the difference between the actual cost and the approved cost of natural gas reflected in rates. EGD and Union Gas have been granted OEB approval to refund this balance to, or to collect this balance from, customers on a rolling 12-month basis via the Quarterly Rate Adjustment Mechanism process.
4
The balances are excluded from the rate base and do not earn an ROE.