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Debt and Capital Structure - Schedule of Long-Term Debt (Detail) $ in Millions, $ in Billions | Sep. 30, 2024 CAD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net Debt Premiums (Discounts) and Transaction Costs | $ 67 |  | $ 80 |
Long-Term Debt | 7,199 |  | 7,108 |
Less: Current Portion | 180 |  | 0 |
Long-Term Debt | 7,019 |  | 7,108 |
Long-Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 7,132 |  | 7,028 |
Long-Term Debt | Revolving Term Debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Revolving Term Debt | 0 |  | 0 |
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | 5,132 | $ 3.8 | 5,028 | $ 3.8
Long-Term Debt | Canadian Dollar Unsecured Notes |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total Debt Principal, (CAD equivalent) | $ 2,000 |  | $ 2,000 |

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