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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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