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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Details of Derivative Instruments (Details) shares in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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Mar. 11, 2022 CAD ($) | Feb. 11, 2022 CAD ($) | Mar. 31, 2022 CAD ($) | Dec. 31, 2022 CAD ($) $ / shares $ / $ shares | Dec. 31, 2022 USD ($) $ / $ | Dec. 31, 2021 CAD ($) $ / $ $ / shares shares | Dec. 31, 2021 USD ($) $ / $ shares | Dec. 31, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) | Mar. 11, 2022 USD ($) | Feb. 11, 2022 USD ($) | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash received (paid) on settlement |  |  |  | $ (11,000,000) |  | $ (8,000,000) |  |  |  |  |  |  |
Payments to settle derivative |  |  |  | 12,379,000,000 |  | 5,236,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | 1,136,000,000 |  | 895,000,000 |  |  |  |  |  |  | $ 1,011,000,000
Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 1,450,000,000 |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  | 5.34% |  |  |  |  |  | 5.34% |
Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | 750,000,000 |  |  |  | $ 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 |  |  |  |  |  |  |  |  |  |
Debt derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | 1,019,000,000 |  |  |  |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  |  |  | 1.333 | 1.333 |  |  |  |  |  |
Payments to settle derivative |  |  |  | 9,956,000,000 |  | $ 3,931,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  | (72,000,000) |  | (11,000,000) |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | 988,000,000 |  | 1,121,000,000 |  |  |  |  |  |  |
Debt derivatives | Credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 0 | $ 0 | $ 1,503,000,000 | $ 1,200,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 0 | 0 | 1.253 | 1.253 |  |  |  |  |  |
Payment on derivatives settled |  |  |  | $ 507,000,000 | $ 400,000,000 | $ 1,003,000,000 | $ 800,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.268 | 1.268 | 1.254 | 1.254 |  |  |  |  |  |
Net cash received (paid) on settlement |  |  |  | $ 9,000,000 |  | $ (2,000,000) |  |  |  |  |  |  |
Debt derivatives | US commercial paper program |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 8,781,000,000 | $ 6,745,000,000 | $ 3,235,000,000 | $ 2,568,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.302 | 1.302 | 1.260 | 1.260 |  |  |  |  |  |
Payment on derivatives settled |  |  |  | $ 9,522,000,000 | $ 7,292,000,000 | $ 2,911,000,000 | $ 2,312,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.306 | 1.306 | 1.259 | 1.259 |  |  |  |  |  |
Net cash received (paid) on settlement |  |  |  | $ 64,000,000 |  | $ (15,000,000) |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  | 2.991% | 5.635% |  |
Hedging effect, net proceeds received from issuances | $ 1,283,000,000 | $ 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 received (paid) on settlement |  |  | $ (75,000,000) |  |  |  |  |  |  |  |  |  |
Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 1,066,000,000 | $ 852,000,000 | $ 545,000,000 | $ 438,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.251 | 1.251 | 1.244 | 1.244 |  |  |  |  |  |
Payment on derivatives settled |  |  |  |  | $ 960,000,000 | $ 1,306,000,000 | $ 960,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.291 | 1.291 | 1.360 | 1.360 |  |  |  |  |  |
Equity derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash received (paid) on settlement |  |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |
Payments to settle derivative |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  | 59.18 |  | 60.98 |  | 59.18 |  |  |  |  |
Derivative financial assets outstanding |  |  |  | $ 54,000,000 |  | $ 36,000,000 |  |  |  |  |  |  | 34,000,000
Number of derivatives settled (in shares) | shares |  |  |  |  |  | 0.5 | 0.5 |  |  |  |  |  |
Derivatives settled, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  | $ 59.64 |  |  |  |  |  |  |
Number of hedging instruments | shares |  |  |  | 0.5 |  | 0.4 |  | 0.5 |  |  |  | 0.4 |
Equity derivatives | Class B Non-Voting Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  | 53.65 |  | 53.10 |  | 53.65 |  |  |  |  |
Derivative financial assets outstanding |  |  |  | $ 5,500,000 |  | $ 5,000,000 |  |  |  |  |  |  |
Equity derivatives | Less than 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  | 50.37 |  |  |  | 50.37 |  |  |  |  |
Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 206,000,000 | $ 156,000,000 | $ 168,000,000 | $ 132,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.321 | 1.321 | 1.273 | 1.273 |  |  |  |  |  |
Payment on derivatives settled |  |  |  | $ 162,000,000 | $ 124,000,000 | $ 108,000,000 | $ 81,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.306 | 1.306 |  |  |  |  |  |  |  |
Currency swap contract [member] | Senior Notes Issued 2022 4.550% |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash received (paid) on settlement |  |  |  | $ 43,000,000 |  |  |  |  |  |  |  |  |
Currency swap contract [member] | 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 |  |  |  |  |  |  |  | 16,100,000,000 |  |  |  | $ 9,050,000,000 |
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 |  |  |  | 1,019,000,000 |  | 0 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | $ 916,000,000 |  | $ 1,110,000,000 |  |  |  |  |  |  | 1,098,000,000
Cash flow hedges | Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 960,000,000 |  |  |  | 1,068,000,000 |
Average foreign exchange rate | $ / $ |  |  |  | 1.250 | 1.250 | 1.287 | 1.287 |  |  |  |  |  |
Payments to settle derivative |  |  |  | $ 1,239,000,000 |  | $ 1,305,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  | $ (94,000,000) |  | (19,000,000) |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  | $ (19,000,000) |  |  |  |  |  |  | $ (109,000,000)
Cash flow hedges | Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 225,000,000 |  |  |  | 193,000,000 |
Average foreign exchange rate | $ / $ |  |  |  | 1.306 | 1.306 | 1.301 | 1.301 |  |  |  |  |  |
Cash flow hedges | Currency swap contract [member] | Senior Notes Issued 2022 4.550% |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 2,000,000,000 |

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