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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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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

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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 + Details
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