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Debt - Scheduled Principal Payments (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings |  | $ 4,162 | $ 5,181
Cost |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 3,232 | 4,198 |
Cost | 2020 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 23 | 29 |
Cost | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 117 | 152 |
Cost | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 202 | 262 |
Cost | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 220 | 286 |
Cost | 2024 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 0 | 0 |
Cost | Thereafter |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 2,670 | $ 3,469 |

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