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Debt - Revolving Facilities - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Nov. 18, 2019 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Debt-to-capitalization ratio, maximum |  | 0.6 | 0.6 |  |
Letter of credit aggregate amount | $ 1,100,000,000 |  |  |  |
Derecognition of financing fees | 26,000,000 |  |  |  |
Borrowings |  |  | $ 4,162,000,000 |  | $ 5,181,000,000
Top of range |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Debt-to-capitalization ratio, actual |  | 0.15 | 0.15 |  |
Debt-to-capitalization ratio, maximum |  | 0.6 | 0.6 |  |
Limited Recourse Project Financing Facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities |  |  |  | $ 2,500,000,000 |
Maximum borrowing capacity |  |  |  | $ 2,500,000,000 |
Revolving Credit Facility Due November 2024 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Undrawn borrowing facilities |  | $ 4,000,000,000 |  |  |
Revolving Credit Facility Due November 2021 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity |  | $ 600,000,000 |  |  |
Letter Of Credit |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Derecognition of financing fees | $ 6,000,000 |  |  |  |
Uncommitted credit facilities |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,900,000,000 |  |
Outstanding letters of credit |  |  | 1,600,000,000 |  |
Stand alone credit facility |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Outstanding letters of credit |  |  | 453,000,000 |  |
Surety Bond |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Borrowings |  |  | $ 450,000,000 |  |

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