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Debt and Capital Structure - Schedule of Long-Term Debt (Detail) - CAD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Net Debt Premiums (Discounts) and Transaction Costs | $ 84 | $ 154
Long-Term Debt | 7,224 | 8,691
Long-Term Debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | 7,140 | 8,537
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) | 5,140 | 6,537
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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