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Debt due within one year - Disclosure of debt due within one year (Details) $ in Millions, $ in Millions | Dec. 31, 2017 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt due within one year | $ (1,106) |  | $ (1,307) |
Total debt due within one year | $ 5,178 |  | 4,887 |
Notes payable | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE | 1.16% | 1.16% |  |
Loans secured by trade receivables | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE | 2.11% | 2.11% |  |
Long-term debt due within one year | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE | 4.38% | 4.38% |  |
Unsecured committed term credit facility | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE |  |  |  |
Finance leases | Weighted average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE | 6.64% | 6.64% |  |
Gross carrying amount | Notes payable |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | $ 3,151 |  | 2,649 |
Gross carrying amount | Loans secured by trade receivables |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | 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 | (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 |  | (479) |
Gross carrying amount | Commercial paper |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | 3,116 | $ 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 | (445) |  | (435) |
Net unamortized discount |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt due within one year | 0 |  | (1) |
Unamortized debt issuance costs |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Total long-term debt due within one year | $ 0 |  | $ (6) |

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