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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Details of Derivative Instruments (Details) $ / shares in Units, shares in Millions |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2020 CAD ($) | Nov. 12, 2019 CAD ($) | Apr. 30, 2019 CAD ($) | Dec. 31, 2020 CAD ($) $ / $ $ / shares shares | Dec. 31, 2020 USD ($) $ / $ shares | Dec. 31, 2019 CAD ($) $ / $ $ / shares shares | Dec. 31, 2019 USD ($) $ / $ shares | Dec. 31, 2020 USD ($) | Jun. 22, 2020 USD ($) | Dec. 31, 2019 USD ($) | Nov. 12, 2019 USD ($) | Apr. 30, 2019 USD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received |  |  |  | $ 80,000,000 |  | $ (121,000,000) |  |  |  |  |  |  |
Payments to settle derivative |  |  |  | 8,047,000,000 |  | 18,865,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | 1,011,000,000 |  | 1,439,000,000 |  |  |  |  |  |  | $ 1,500,000,000
Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 750,000,000 | $ 750,000,000 |  |  |  |
Spread on variable rate |  |  |  |  |  |  |  |  | 0.60% |  |  |  |
Hedging effect, net proceeds received from issuances | $ 1,019,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2022 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  |  |
Senior Notes Due 2049 - 4.350% | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 1,250,000,000 |  | $ 1,250,000,000 |  | $ 1,250,000,000 |
Coupon rate |  |  |  | 4.35% |  |  |  | 4.35% |  |  |  | 4.35% |
Hedging effect, net proceeds received from issuances |  |  | $ 1,676,000,000 |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2049 - 3.700% | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 1,000,000,000 |  | 1,000,000,000 | $ 1,000,000,000 |  |
Coupon rate |  |  |  | 3.70% |  |  |  | 3.70% |  |  | 3.70% |  |
Hedging effect, net proceeds received from issuances |  | $ 1,308,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes Due 2029 | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  | 3.25% |  |  |  | 3.25% |  |  |  |  |
Debt derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of outstanding bond forwards |  |  |  | $ 583,000,000 |  | 1,618,000,000 |  | $ 449,000,000 |  | 1,223,000,000 |  |  |
Payments to settle derivative |  |  |  | 6,826,000,000 |  | 17,630,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  | 12,000,000 |  | 29,000,000 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | 1,086,000,000 |  | 1,383,000,000 |  |  |  |  |  |  |
Debt derivatives | Credit facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 1,385,000,000 | $ 970,000,000 | $ 561,000,000 | $ 420,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.428 | 1.428 | 1.336 | 1.336 |  |  |  |  |  |
Debt derivatives settled, notional amount |  |  |  | $ 1,364,000,000 | $ 970,000,000 | $ 564,000,000 | $ 420,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.406 | 1.406 | 1.343 | 1.343 |  |  |  |  |  |
Net cash (paid) received |  |  |  | $ (21,000,000) |  | $ 3,000,000 |  |  |  |  |  |  |
Debt derivatives | Commercial paper program |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 4,406,000,000 | $ 3,316,000,000 | $ 17,127,000,000 | $ 12,897,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.329 | 1.329 | 1.328 | 1.328 |  |  |  |  |  |
Debt derivatives settled, notional amount |  |  |  | $ 5,441,000,000 | $ 4,091,000,000 | $ 17,069,000,000 | $ 12,847,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.330 | 1.330 | 1.329 | 1.329 |  |  |  |  |  |
Net cash (paid) received |  |  |  | $ 101,000,000 |  | $ (13,000,000) |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2022 | Floating interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  | 0.955% |  |  |  |
Hedging effect, net proceeds received from issuances | $ 1,019,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2049 - 4.350% | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  |  | 4.173% |
Hedging effect, net proceeds received from issuances |  |  | $ 1,676,000,000 |  |  | 1,676,000,000 |  |  |  |  |  |  |
Debt derivatives | Senior Notes Due 2049 - 3.700% | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon rate |  |  |  |  |  |  |  |  |  |  | 3.996% |  |
Hedging effect, net proceeds received from issuances |  | $ 1,308,000,000 |  |  |  | 1,308,000,000 |  |  |  |  |  |  |
Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 158,000,000 | $ 115,000,000 | $ 92,000,000 | $ 70,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.374 | 1.374 | 1.314 | 1.314 |  |  |  |  |  |
Debt derivatives settled, notional amount |  |  |  | $ 59,000,000 | $ 43,000,000 | $ 0 | $ 0 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.372 | 1.372 |  |  |  |  |  |  |  |
Bond forwards | Senior Notes Due 2049 - 4.350% |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | 1,250,000,000 |  |  |
Bond forwards | Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |
Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt derivatives entered, notional |  |  |  | $ 2,095,000,000 | $ 1,560,000,000 | $ 1,070,000,000 | $ 810,000,000 |  |  |  |  |  |
Debt derivatives entered, exchange rate | $ / $ |  |  |  | 1.343 | 1.343 | 1.321 | 1.321 |  |  |  |  |  |
Debt derivatives settled, notional amount |  |  |  | $ 1,221,000,000 | $ 940,000,000 | $ 1,124,000,000 | $ 900,000,000 |  |  |  |  |  |
Debt derivatives settled, exchange rate | $ / $ |  |  |  | 1.299 | 1.299 | 1.249 | 1.249 |  |  |  |  |  |
Equity derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash (paid) received |  |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |
Payments to settle derivative |  |  |  | $ 0 |  | 0 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | 34,000,000 |  | $ 55,000,000 |  |  |  |  |  |  | 92,000,000
Net payments to reset weighted average price of derivative instruments |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |
Weighted average price after reset (in dollars per share) | $ / shares |  |  |  | $ 54.16 |  |  |  |  |  |  |  |  |
Number of derivatives reset (in shares) | shares |  |  |  | 0.5 | 0.5 |  |  |  |  |  |  |  |
Number of derivatives entered into (in shares) | shares |  |  |  | 0.3 | 0.3 | 0.0 | 0.0 |  |  |  |  |  |
Derivatives entered into, weighted average price (in dollars per share) | $ / shares |  |  |  | $ 56.08 |  | $ 0 |  |  |  |  |  |  |
Number of derivatives settled (in shares) | shares |  |  |  |  |  | 0.7 | 0.7 |  |  |  |  |  |
Derivatives settled, weighted average price (in dollars per share) | $ / shares |  |  |  |  |  | $ 71.66 |  |  |  |  |  |  |
Equity derivatives | Class B Non-Voting Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  | 51.82 |  | 51.76 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | $ 4,600,000 |  | $ 4,300,000 |  |  |  |  |  |  |
Equity derivatives | Less than 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average price of hedging instrument | $ / shares |  |  |  | 50.37 |  |  |  |  |  |  |  |  |
Cash flow hedges | Debt derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 9,200,000,000 |  | 8,400,000,000 |  |  |
Notional amount of outstanding bond forwards |  |  |  | $ 6,201,000,000 |  | 3,409,000,000 |  | 4,642,000,000 |  | 2,570,000,000 |  |  |
Payments to settle derivative |  |  |  | 0 |  | 0 |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  | $ 1,098,000,000 |  | $ 1,412,000,000 |  |  |  |  |  |  | 1,332,000,000
Cash flow hedges | Lease Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 142,000,000 |  | $ 70,000,000 |  |  |
Average foreign exchange rate | $ / $ |  |  |  | 1.35 | 1.35 | 1.32 | 1.32 |  |  |  |  |  |
Cash flow hedges | Bond forwards |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | $ 111,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  | $ 0 |  | 0 |  |  |  |  |  |  | 87,000,000
Cash flow hedges | Bond forwards | Senior Notes Due 2049 - 4.350% |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of outstanding bond forwards |  |  |  |  |  | 400,000,000 |  |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | 57,000,000 |  |  |  |  |  |  |
Cash flow hedges | Bond forwards | Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of outstanding bond forwards |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |
Payments to settle derivative |  |  |  |  |  | $ 54,000,000 |  |  |  |  |  |  |
Cash flow hedges | Expenditure derivatives |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of derivatives designated as hedges |  |  |  | 100.00% |  | 100.00% |  | 100.00% |  | 100.00% |  |  |
Notional amount |  |  |  |  |  |  |  | $ 1,590,000,000 |  | $ 990,000,000 |  |  |
Average foreign exchange rate | $ / $ |  |  |  | 1.34 | 1.34 | 1.30 | 1.30 |  |  |  |  |  |
Notional amount of outstanding bond forwards |  |  |  | $ 2,134,000,000 |  | $ 952,000,000 |  | $ 1,590,000,000 |  | $ 720,000,000 |  |  |
Payments to settle derivative |  |  |  | 1,221,000,000 |  | 1,124,000,000 |  |  |  |  |  |  |
Outstanding bond forwards |  |  |  | $ 109,000,000 |  |  |  |  |  |  |  |  |
Derivative financial assets outstanding |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  | $ 122,000,000
Cash flow hedges | Expenditure derivatives | Less than 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |  |
Average foreign exchange rate | $ / $ |  |  |  | 1.36 | 1.36 |  |  |  |  |  |  |  |

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