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Risk Management Activities - Impact of Hedged Items Designated in Hedging Relationships on OCI and Net Earnings (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about hedging instruments [line items] |  |  |
Total gains (losses) included in earnings before income taxes | $ 51 | $ (694) | $ (255)
Losses recognized in other comprehensive loss | 75 | 126 | (8)
Location of (gain) loss reclassified from OCI | 0 | 0 | 0
Commodity Contracts |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Total gains (losses) included in earnings before income taxes | 51 | (747) | (268)
Commodity Contracts | Revenue |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Losses recognized in other comprehensive loss | 83 | 124 | (13)
Location of (gain) loss reclassified from OCI | 0 | 0 | 0
Foreign Exchange Forwards On Project Hedges |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Total gains (losses) included in earnings before income taxes |  |  | 0
Foreign Exchange Forwards On Project Hedges | Property Plants And Equipment |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Losses recognized in other comprehensive loss |  |  | 1
Location of (gain) loss reclassified from OCI |  |  | 0
Forward Starting Interest Rate Swaps |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Total gains (losses) included in earnings before income taxes | 0 | 53 | 13
Forward Starting Interest Rate Swaps | Interest Expense1 |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Losses recognized in other comprehensive loss | (8) | 2 | 4
Location of (gain) loss reclassified from OCI | $ 0 | $ 0 | $ 0

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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gains (losses) recognised in other comprehensive income on cash flow hedges, before tax, before reclassification adjustments. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 + Details
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