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Regulatory Assets and Liabilities (Regulated Assets) (Details) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory Assets, Current	$ 121	$ 165
Regulatory Assets, Long-term	1,431	1,404
Total regulatory assets	1,552	1,569
Deferred income tax regulatory assets
Regulatory Assets [Line Items]
Total regulatory assets	862	775
Pension and post-retirement medical plan
Regulatory Assets [Line Items]
Total regulatory assets	380	453
Deferrals related to derivative instruments
Regulatory Assets [Line Items]
Total regulatory assets	81	10
Storm reserve
Regulatory Assets [Line Items]
Total regulatory assets	38	32
Stranded cost recovery
Regulatory Assets [Line Items]
Total regulatory assets	27	28
Environmental remediations
Regulatory Assets [Line Items]
Total regulatory assets	26	31
Demand side management ("DSM") deferral
Regulatory Assets [Line Items]
Total regulatory assets	19	24
Unamortized defeasance costs
Regulatory Assets [Line Items]
Total regulatory assets	19	26
Cost recovery clauses
Regulatory Assets [Line Items]
Total regulatory assets	13	75
Other
Regulatory Assets [Line Items]
Total regulatory assets	$ 87	$ 115

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
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- Definition

Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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