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v3.21.1

Property, plant and equipment (Regulated and Non-regulated Assets) (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment, Net |  |
Total cost | $ 25,891 | $ 24,893
Less: Accumulated depreciation | (8,714) | (8,317)
Total cost less: Accumulated depreciation | 17,177 | 16,576
Construction work in progress | 2,358 | 1,591
Property, Plant and Equipment, Net | 19,535 | 18,167
Generation |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 11,474 | 11,181
Generation | Range, Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 3 years |
Generation | Range, Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 131 years |
Transmission |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 2,414 | 2,318
Transmission | Range, Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 11 years |
Transmission | Range, Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 80 years |
Distribution |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 5,997 | 5,820
Distribution | Range, Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 4 years |
Distribution | Range, Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 80 years |
Gas transmission and distribution |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 3,879 | 3,568
Gas transmission and distribution | Range, Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 7 years |
Gas transmission and distribution | Range, Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 85 years |
General plant and other |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 2,127 | $ 2,006
General plant and other | Range, Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 2 years |
General plant and other | Range, Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Estimated useful life | 60 years |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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