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Financial Instrument Risk Management - Narrative (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial assets [line items] |  |
Percent of debt security portfolio considered investment grade | 99.00% | 98.00%
Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Impairment loss on available-for-sale assets | $ 11,000,000 | $ 19,000,000
Debt securities | Available- for-sale |  |
Disclosure of financial assets [line items] |  |
Reversal of impairment | $ 0 | $ 0

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- Definition The amount of impairment loss on financial assets. [Refer: Financial assets; Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_e&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition The amount recognised as an increase of the carrying amount of an asset or cash-generating unit to its recoverable amount when an impairment loss had been previously recognised. [Refer: Impairment loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_d_ii&doctype=Standard -URIDate 2021-03-24 + Details
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