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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