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Capital Management - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) creditFacility | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 CAD ($) creditFacility
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Targeted debt-to-EBITDA ratio | 2 |  |
Number of credit facilities | creditFacility | 1 |  | 1
Borrowings |  | $ 6,255 | $ 7,374
Debt-to-capitalization ratio, maximum | 0.6 |  | 0.6
Actual debt-to-EBITDA ratio | 120.00% | 270.00% |
Actual net debt-to-capitalization ratio | 0.22 | 0.24 | 0.22
Revolving Credit Facility Due November 2023 |  |  |
Disclosure of objectives, policies and processes for managing capital [line items] |  |  |
Maximum borrowing capacity | $ 4,000,000,000 |  |

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- Details
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