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Financial Instruments - Inception Gains And Losses (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Changes in aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss [abstract] |  |  |
Unamortized net gain (loss) at beginning of year | $ (33) | $ 9 | $ 49
New inception gains (losses) | (50) | (13) | 3
Amortization recorded in net earnings during the year | (19) | (29) | (43)
Unamortized net gain (loss) at end of year | $ (102) | $ (33) | $ 9

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- Definition The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_28_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_28_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss resulting from new transactions. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph IG14 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_IG14&doctype=Implementation%20Guidance -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_28_b&doctype=Standard -URIDate 2021-03-24 + Details
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