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Long-term Debt and Capital Structure - Schedule of Long Term Debt (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Debt Discounts and Transaction Costs | $ (69) | $ (58)
Long-Term Debt | 7,441 | 6,699
Long-term Borrowings [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | 7,510 | 6,757
Long-term Borrowings [Member] | Revolving Term Debt [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Revolving Term Debt |  | 265
Long-term Borrowings [Member] | U.S. Dollar Denominated Unsecured Notes [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | $ 7,510 | $ 6,492

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