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Debt due within one year - Schedule of Debt Due Within One Year (Details) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |
Current portion of non-current borrowings | $ 975 |  | $ 837 |
Total debt due within one year | $ 2,417 |  | 3,881 |
Notes payable | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 0.24% | 0.24% |  |
Loans secured by trade receivables | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 1.10% | 1.10% |  |
Long-term debt due within one year | Weighted Average |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2020 | 5.52% | 5.52% |  |
Gross carrying amount | Notes payable |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | $ 392 |  | 1,994 |
Gross carrying amount | Loans secured by trade receivables |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | 1,050 |  | 1,050 |
Gross carrying amount | Long-term debt due within one year |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current portion of non-current borrowings | 975 |  | 837 |
Gross carrying amount | Commercial Paper |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current borrowings | 349 | $ 274 | 1,951 | $ 1,502
Gross carrying amount | Finance Leases |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Current portion of non-current borrowings | $ 754 |  | $ 775 |

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- Definition The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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