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Financial Instruments - Inception Gains And Losses (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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 | $ (213) | $ (131) | $ (33)
New inception loss |  | (37) | (79)
Change resulting from amended contract |  | 0 | 0
Change in foreign exchange rates |  | (10) | 0
Amortization recorded in net earnings during the year |  | (35) | (19)
Unamortized net gain (loss) at end of year |  | (213) | $ (131)
Impacts of the PPA Contract Amendments |  |  |
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 | (213) |  |
New inception loss | 47 |  |
Change resulting from amended contract | 190 |  |
Change in foreign exchange rates | 6 |  |
Amortization recorded in net earnings during the year | (27) |  |
Unamortized net gain (loss) at end of year | $ 3 | $ (213) |

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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 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 + 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 amounts 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; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph IG14 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_IG14&doctype=Implementation%20Guidance -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in financial assets resulting from foreign exchange. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph IG20B -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph IG14 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_IG14&doctype=Implementation%20Guidance -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 + Details
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