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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Details of Derivative Instruments (Details) shares in Thousands, instrument in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 11, 2022 CAD ($) | Feb. 11, 2022 CAD ($) | Oct. 31, 2023 CAD ($) | Mar. 31, 2022 CAD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2023 CAD ($) $ / $ $ / shares shares | Dec. 31, 2023 USD ($) $ / $ | Dec. 31, 2022 CAD ($) $ / shares $ / $ instrument | Dec. 31, 2022 USD ($) $ / $ | Dec. 31, 2023 USD ($) $ / shares shares | Oct. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares instrument | Mar. 11, 2022 USD ($) | Feb. 11, 2022 USD ($) | Dec. 31, 2021 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives acquired, notional |  |  |  |  |  | $ 282,000,000 | $ 212,000,000 | $ 0 | $ 0 |  |  |  |  |  |
Debt derivatives acquired, exchange rate |  |  |  |  |  | 1.330 | 1.330 | 0 | 0 |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  |  |  | $ 492,000,000 |  | $ (11,000,000) |  |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | 53,831,000,000 |  | 12,379,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  | (538,000,000) |  | 1,136,000,000 |  |  |  |  |  |  | $ 895,000,000
Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 | $ 1,000,000,000 | $ 750,000,000 |
Spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 2.95% | 5.25% |
Senior Notes Issued 2022 3.200% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300,000,000 |  |
Spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.20% |  |
Senior Notes Issued 2022 3.800% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
Spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.80% |  |
Senior Notes Issued 2022 4.500% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |
Spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 4.50% |  |
Senior Notes Issued 2022 4.550% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |
Spread on variable rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 4.55% |  |
Floating Rate Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  |  | $ 1,019,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2023 - 4.100% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | $ 850,000,000 |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  | 4.10% |  |  |  |
Repayment of long-term debt |  |  | $ 877,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 2,188,000,000 |  | $ 1,019,000,000 |  |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  |  |  | 1.306 | 1.306 |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  | (60,000,000) |  |  |  |  |  |  |  |  |  |  |
Notional amount of outstanding bond forwards |  |  |  |  |  | 4,537,000,000 |  |  |  | $ 3,354,000,000 |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | 49,642,000,000 |  | $ 9,956,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  |  |  | 101,000,000 |  | (72,000,000) |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  | (571,000,000) |  | 988,000,000 |  |  |  |  |  |  |
Debt derivatives | Credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  |  |  | $ 51,517,000,000 | $ 38,205,000,000 | $ 0 | $ 0 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  |  |  | 1.348 | 1.348 | 0 | 0 |  |  |  |  |  |
Payment on derivatives settled |  |  |  |  |  | $ 47,126,000,000 | $ 34,964,000,000 | $ 507,000,000 | $ 400,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  | 1.348 | 1.348 | 1.268 | 1.268 |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  |  |  | $ (10,000,000) |  | $ 9,000,000 |  |  |  |  |  |  |
Debt derivatives | US commercial paper program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  |  |  | $ 2,447,000,000 | $ 1,803,000,000 | $ 8,781,000,000 | $ 6,745,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  |  |  | 1.357 | 1.357 | 1.302 | 1.302 |  |  |  |  |  |
Payment on derivatives settled |  |  |  |  |  | $ 2,486,000,000 | $ 1,848,000,000 | $ 9,522,000,000 | $ 7,292,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  | 1.345 | 1.345 | 1.306 | 1.306 |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  |  |  | $ (20,000,000) |  | $ 64,000,000 |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.451% | 5.635% |
Hedging effect, net proceeds received from issuances | $ 1,334,000,000 | $ 951,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Issued 2022 3.200% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.413% |  |
Hedging effect, net proceeds received from issuances | 1,674,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Issued 2022 3.800% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.232% |  |
Hedging effect, net proceeds received from issuances | 2,567,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Issued 2022 4.500% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.178% |  |
Hedging effect, net proceeds received from issuances | 966,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Issued 2022 4.550% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.305% |  |
Hedging effect, net proceeds received from issuances | $ 2,564,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Floating Rate Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  | (75,000,000) |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2023 - 4.100% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  | $ 288,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  |  | $ (1,000,000,000) |  |  |  |  |  |  |  |  |  |
Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  |  |  | $ 2,187,000,000 | $ 1,650,000,000 | $ 1,066,000,000 | $ 852,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  |  |  | 1.325 | 1.325 | 1.251 | 1.251 |  |  |  |  |  |
Payment on derivatives settled |  |  |  |  |  |  | $ 1,172,000,000 | $ 1,239,000,000 | $ 960,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  | 1.262 | 1.262 | 1.291 | 1.291 |  |  |  |  |  |
Equity derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  |  |  | 58.14 |  | 59.18 |  | 58.14 |  | 59.18 |  |  |
Derivative financial assets outstanding |  |  |  |  |  | $ 48,000,000 |  | $ 54,000,000 |  |  |  |  |  |  | 36,000,000
Number of hedging instruments |  |  |  |  |  | 500 |  | 500 |  | 500 |  | 500 |  |  |
Equity derivatives | Class B Non-Voting Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  |  |  | 54.02 |  | 53.65 |  | 54.02 |  | 53.65 |  |  |
Derivative financial assets outstanding |  |  |  |  |  | $ 6,000,000 |  | $ 5,500,000 |  |  |  |  |  |  |
Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  |  |  | $ 366,000,000 | $ 274,000,000 | $ 206,000,000 | $ 156,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  |  |  | 1.336 | 1.336 | 1.321 | 1.321 |  |  |  |  |  |
Payment on derivatives settled |  |  |  |  |  | $ 186,000,000 | $ 142,000,000 | $ 162,000,000 | $ 124,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  | 1.310 | 1.310 |  |  |  |  |  |  |  |
Currency swap contract | Senior Notes Issued 2022 4.550% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received on settlement |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |
Currency swap contract | Senior Notes Issued 2022 4.550% | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |
Cash flow hedges | Senior Notes, Debentures, And Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 14,750,000,000 |  | $ 16,100,000,000 |  |  |
Average foreign exchange rate | $ / $ |  |  |  |  |  | 1.259 | 1.259 | 1.233 | 1.233 |  |  |  |  |  |
Cash flow hedges | Debt derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 8,930,000,000 |  |  |  | 6,950,000,000 |  |  |
Payments to settle derivative |  |  |  |  |  | $ 2,710,000,000 |  | 1,019,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  | $ (470,000,000) |  | $ 916,000,000 |  |  |  |  |  |  | 1,110,000,000
Cash flow hedges | Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 1,650,000,000 |  | 960,000,000 |  |  |
Average foreign exchange rate | $ / $ |  |  |  |  |  | 1.325 | 1.325 | 1.250 | 1.250 |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | $ 1,479,000,000 |  | $ 1,239,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  |  |  | $ 15,000,000 |  | 94,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  |  |  | $ 94,000,000 |  |  |  |  |  |  | $ (19,000,000)
Cash flow hedges | Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 357,000,000 |  | $ 225,000,000 |  |  |
Average foreign exchange rate | $ / $ |  |  |  |  |  | 1.329 | 1.329 | 1.306 | 1.306 |  |  |  |  |  |
Cash flow hedges | Currency swap contract | Senior Notes Issued 2022 4.550% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_7&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + 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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- Definition The cash inflow from non-current borrowings obtained. [Refer: 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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