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SHORT-TERM BORROWINGS - Short-term Borrowings (Details) $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total short-term borrowings | $ 1,221 |  | $ 2,238 |  |  |
Receivables securitization program |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total short-term borrowings | 650 |  | 650 |  |  |
US commercial paper program |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Total short-term borrowings | $ 571 | $ 449 | $ 1,600 | $ 1,223 | $ 1,605 | $ 1,177

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