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Debt - Scheduled Principal Payments (Details) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings |  | $ 6,255 | $ 4,162
Cost |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 4,977 | 6,337 |
Cost | 2021 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 90 | 115 |
Cost | 2022 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 150 | 190 |
Cost | 2023 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 243 | 310 |
Cost | 2024 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 397 | 505 |
Cost | 2025 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | 135 | 172 |
Cost | Thereafter |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings | $ 3,962 | $ 5,045 |

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