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v3.20.1

Property, plant and equipment (Regulated and Non-regulated Assets) (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment, Net |  |
Total cost | $ 24,871 | $ 26,043
Less: Accumulated depreciation | (8,295) | (8,567)
Total cost less: Accumulated depreciation | 16,576 | 17,476
Construction work in progress | 1,591 | 1,236
Property, Plant and Equipment, Net | 18,167 | 18,712
Generation |  |
Property, Plant and Equipment, Net |  |
Total cost | $ 11,181 | 11,092
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 | $ 2,318 | 3,047
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 | $ 5,820 | 6,348
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 | $ 3,546 | 3,398
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 | $ 2,006 | $ 2,158
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=6877327&loc=d3e13212-122682 + Details
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