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SHORT-TERM BORROWINGS - Movement in 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] |  |  |  |
Short-term borrowings, beginning balance | $ 2,238 |  |  |
Net (repayment of) proceeds received from short-term borrowings | (1,146) |  | $ 30 |
Loss (gain) on foreign exchange | 107 |  | (79) |
Short-term borrowings, ending balance | 1,221 |  | 2,238 |
Commercial paper program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-term borrowings, beginning balance | $ 1,600 | $ 1,223 | $ 1,605 | $ 1,177
Exchange rate on short-term borrowings | $ / $ | 1.298 | 1.298 | 1.364 | 1.364
Net (repayment of) proceeds received from short-term borrowings | $ (1,146) | $ (782) | $ 33 | $ 21
Exchange rate on (repayment of) proceeds received from short-term borrowings, net | $ / $ | 1.465 | 1.465 | 1.571 | 1.571
Discount on issuance | $ 10 | $ 8 | $ 33 | $ 25
Exchange rate on discounts on issuance of short-term borrowings | $ / $ | 1.250 | 1.250 | 1.320 | 1.320
Loss (gain) on foreign exchange | $ 119 |  | $ (83) |
Short-term borrowings, ending balance | $ 571 | $ 449 | $ 1,600 | $ 1,223
Exchange rate on short-term borrowings | $ / $ | 1.272 | 1.272 | 1.298 | 1.298

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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2020-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=21&code=ifrs-tx-2020-en-r&anchor=para_52_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of 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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