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SHORT-TERM BORROWINGS - Movement in Borrowing Programs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 CAD ($) $ / $ | Dec. 31, 2023 USD ($) $ / $ | Dec. 31, 2022 CAD ($) $ / $ | Dec. 31, 2022 USD ($) $ / $
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-term borrowings, beginning balance | $ 2,985,000,000 |  |  |
Net (repayment of) proceeds received from short-term borrowings | (1,439,000,000) |  | $ 707,000,000 |
Amortization of deferred transaction costs | 136,000,000 |  | 51,000,000 |
Loss (gain) on foreign exchange | (111,000,000) |  | 127,000,000 |
Short-term borrowings, ending balance | 1,750,000,000 |  | 2,985,000,000 |
US commercial paper program |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-term borrowings, beginning balance | $ 214,000,000 | $ 158 | $ 893,000,000 | $ 704
Exchange rate on short-term borrowings | $ / $ | 1.354 | 1.354 | 1.268 | 1.268
Net (repayment of) proceeds received from short-term borrowings | $ (52,000,000) | $ (55) | $ (756,000,000) | $ (558)
Exchange rate on (repayment of) proceeds received from short-term borrowings, net | $ / $ |  |  | 1.355 | 1.355
Discount on issuance | $ 14,000,000 | $ 10 | $ 15,000,000 | $ 12
Exchange rate on discounts on issuance of short-term borrowings | $ / $ | 1.400 | 1.400 | 1.250 | 1.250
Loss (gain) on foreign exchange | $ (26,000,000) |  | $ 62,000,000 |
Short-term borrowings, ending balance | $ 150,000,000 | $ 113 | $ 214,000,000 | $ 158
Exchange rate on short-term borrowings | $ / $ | 1.327 | 1.327 | 1.354 | 1.354
Non-revolving credit facility borrowings |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Short-term borrowings, beginning balance | $ 371,000,000 |  | $ 507,000,000 |
Net (repayment of) proceeds received from short-term borrowings | (387,000,000) |  | (137,000,000) |
Amortization of deferred transaction costs | 12,000,000 |  | 0 |
Loss (gain) on foreign exchange | 4,000,000 |  | 1,000,000 |
Short-term borrowings, ending balance | $ 0 |  | $ 371,000,000 |

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2023-01-01 -Paragraph 26 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=23&code=ifrs-tx-2023-en-r&anchor=para_26_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The cash inflow (outflow) due to an increase (decrease) in current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_17&doctype=Standard -URIDate 2023-03-23 + Details
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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/disclosureRef -Name IAS -Number 21 -IssueDate 2023-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_52_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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