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Asset Impairment Charges - Detailed Information About Property, Plant, and Equipment (Details) - CAD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		$ 9	$ 648	$ 84
Impairment charges		0	10
Hydro generation
Disclosure of detailed information about property, plant and equipment [line items]
Impairment charges			1
Kaybob Cogeneration Project | Corporate
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		(2)	27	0
Impairment charges	$ 27
Hydro
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		21	5	2
Wind and Solar
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		43	12	0
Gas
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		0	5	0
Energy Transition
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		0	540	82
Changes in decommissioning and restoration provisions on retired assets
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		(53)	32	0
Intangible asset impairment charges - Coal Rights
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		0	17	0
Project development costs
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges		$ 0	10	$ 0
Project development costs | Hydro generation
Disclosure of detailed information about property, plant and equipment [line items]
Impairment charges			$ 9

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- Definition

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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss]

+ References

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