Asset and Goodwill Impairment Testing - Summary of Pre-tax Impairment Reversal and (Asset Impairments) Recorded in Statement of Income (Detail) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Disclosure of impairment loss and reversal of impairment loss [line items]
Asset impairments	$ 0	$ 215
Carmen de Andacollo CGU
Disclosure of impairment loss and reversal of impairment loss [line items]
Asset impairments	$ 0	$ 215

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]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-URIDate 2022-03-24

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