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Debt - Summary of Debt Continuity (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($)
Financial Instruments [Abstract] |  |  |  |
Borrowings at beginning of period | $ 4,940 | $ 6,534 | $ 5,292 | $ 7,167
Cash flows |  |  |  |
Proceeds from debt | 56 | 77 | 170 | 230
Redemption, purchase or repayment of debt | (1,870) | (2,544) | (530) | (710)
Non-cash changes |  |  |  |
Loss on debt redemption or purchase | (4) | (5) | 0 | 0
Changes in foreign exchange rates | 0 | 458 | 0 | (164)
Finance fees, discount amortization and other | 27 | 11 | 8 | 11
Borrowings at end of period | $ 3,149 | $ 4,531 | $ 4,940 | $ 6,534

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 44B -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 44D -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_44D&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Cash Flows From Used In Increase Decrease In Borrowings [abstract] + References No definition available. + Details
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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition Loss (gain) on debt repurchases, non cash transactions + References No definition available. + Details
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- Definition Non-cash transactions, finance fees and discount amortization. + References No definition available. + Details
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- Definition Increase (decrease) through redemptions of borrowings and scheduled repayments, liabilities arising from financing activities + References No definition available. + Details
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