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Debt and Capital Structure - Schedule of Long-Term Debt (Detail) - CAD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Net Debt Premiums (Discounts) and Transaction Costs | $ 207 | $ 272
Long-Term Debt | 11,228 | 12,385
Long-Term Debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | 11,021 | 12,113
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) | 9,021 | 9,363
Long-Term Debt | Canadian Dollar Unsecured Notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | $ 2,000 | $ 2,750

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