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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | $ 295 | $ 251
Regulatory Liability, Long-term | 1,886 | 2,359
Total regulatory liabilities | 2,181 | 2,610
Deferred income tax regulatory liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 985 | 1,218
Accumulated reserve - cost of removal |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 891 | 955
Regulated fuel adjustment mechanism |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 115 | 161
Storm reserve |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 62 | 76
Cost recovery clauses |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 53 | 30
Deferrals related to derivative instruments |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 42 | 116
Self-insurance fund |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 29 | 30
Other |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | $ 4 | $ 24

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