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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Regulatory Liability, Current	$ 129	$ 295
Regulatory Liability, Long-term	1,832	1,886
Total regulatory liabilities	1,961	2,181
Deferred income tax regulatory liabilities
Regulatory Liabilities [Line Items]
Total regulatory liabilities	933	985
Accumulated reserve - cost of removal
Regulatory Liabilities [Line Items]
Total regulatory liabilities	865	891
Storm reserve
Regulatory Liabilities [Line Items]
Total regulatory liabilities	62	62
Cost recovery clauses
Regulatory Liabilities [Line Items]
Total regulatory liabilities	31	53
Self-insurance fund
Regulatory Liabilities [Line Items]
Total regulatory liabilities	28	29
Regulated fuel adjustment mechanism
Regulatory Liabilities [Line Items]
Total regulatory liabilities	21	115
Deferrals related to derivative instruments
Regulatory Liabilities [Line Items]
Total regulatory liabilities	15	42
Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	$ 6	$ 4

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities 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 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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No definition available.

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- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities 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 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities 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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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