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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Principal Repayments (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about borrowings [line items] |  |
Borrowings | CAD 3,707 | CAD 4,361
Gross carrying amount |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 3,664 |
Gross carrying amount | 2018 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 730 |
Gross carrying amount | 2019 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 469 |
Gross carrying amount | 2020 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 472 |
Gross carrying amount | 2021 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 100 |
Gross carrying amount | 2022 |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | 581 |
Gross carrying amount | 2023 and thereafter |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | CAD 1,312 |

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