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SHORT-TERM BORROWINGS - Proceeds/Repayments From Borrowing Programs (Details) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Net (repayment of) proceeds received from short-term borrowings | $ (1,146) |  | $ 30 |
Commercial paper program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | $ 4,406 | $ 3,316 | $ 17,127 | $ 12,897
Exchange rate on proceeds received from short-term borrowings | 1.329 | 1.329 | 1.328 | 1.328
Repayments of short-term borrowings | $ (5,552) | $ (4,098) | $ (17,094) | $ (12,876)
Exchange rate on repayments of short-term borrowings | 1.355 | 1.355 | 1.328 | 1.328
Net (repayment of) proceeds received from short-term borrowings | $ (1,146) | $ (782) | $ 33 | $ 21
Credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Proceeds received from short-term borrowings | $ 0 | $ 0 | $ 561 | $ 420
Exchange rate on proceeds received from short-term borrowings | 0 | 0 | 1.336 | 1.336
Repayments of short-term borrowings | $ 0 | $ 0 | $ (564) | $ (420)
Exchange rate on repayments of short-term borrowings | 0 | 0 | 1.343 | 1.343
Net (repayment of) proceeds received from short-term borrowings | $ 0 |  | $ (3) |

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