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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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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.

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