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Debt due within one year - Schedule of Debt Due Within One Year (Details) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2017 CAD ($) | Jan. 01, 2017 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | $ 525 | $ 1,106 |  |  |  | $ 1,307 |
Total debt due within one year | 4,645 | 5,178 |  |  |  | 4,887 |
Repayments of non-current borrowings | $ 2,713 | 2,653 |  |  |  |  |
Notes payable | Weighted Average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 2.82% |  |  | 2.82% |  |  |
Loans secured by trade receivables | Weighted Average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 2.83% |  |  | 2.83% |  |  |
Long-term debt due within one year | Weighted Average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 5.16% |  |  | 5.16% |  |  |
Unsecured committed term credit facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Repayments of non-current borrowings |  | 480 | $ 357 |  |  |  |
Finance leases | Weighted Average |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2018 | 6.67% |  |  | 6.67% |  |  |
Gross carrying amount | Notes payable |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Current borrowings | $ 3,201 | 3,151 |  |  |  | 2,649 |
Gross carrying amount | Loans secured by trade receivables |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Current borrowings | 919 | 921 |  |  |  | 931 |
Gross carrying amount | Long-term debt due within one year |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | 525 | 1,106 |  |  |  | 835 |
Gross carrying amount | Unsecured committed term credit facility |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | 0 | 0 |  |  |  | 479 |
Gross carrying amount | Commercial paper |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Current borrowings | 3,156 | 3,116 |  | $ 2,314 | $ 2,484 | 2,612 | $ 1,945
Gross carrying amount | Finance leases |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | 466 | 445 |  |  |  | 435 |
Net unamortized discount |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | 0 | 0 |  |  |  | 1 |
Unamortized debt issuance costs |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Total long-term debt due within one year | $ 0 | $ 0 |  |  |  | $ 6 |

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