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FINANCIAL RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Details of Derivative Instruments (Details)
shares in Millions
 12 Months Ended
Nov. 12, 2019
CAD ($)
Apr. 30, 2019
CAD ($)
Feb. 08, 2018
CAD ($)
Dec. 31, 2019
CAD ($)
$ / shares
$ / $
shares
Dec. 31, 2019
USD ($)
$ / $
shares
Dec. 31, 2018
CAD ($)
$ / shares
$ / $
shares
Dec. 31, 2018
USD ($)
$ / $
shares
Dec. 31, 2019
USD ($)
$ / shares
Nov. 12, 2019
USD ($)
Apr. 30, 2019
USD ($)
Jan. 01, 2019
CAD ($)
Dec. 31, 2018
USD ($)
$ / shares
Feb. 08, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of detailed information about financial instruments [line items]                            
Increase (decrease) to net income related to hedge ineffectiveness       $ 0   $ (10,000,000)                
Net cash received (paid)       (121,000,000)   388,000,000                
Loss reclassified from hedging reserve       80,000,000   (95,000,000)                
Payments to settle derivative       18,865,000,000   21,834,000,000                
Stock-based compensation expense (recovery)       70,000,000   65,000,000                
Fair value of derivative assets       101,000,000   270,000,000         $ 270,000,000      
Derivative financial assets outstanding       1,439,000,000   1,500,000,000               $ 1,094,000,000
Equity derivatives                            
Disclosure of detailed information about financial instruments [line items]                            
Stock-based compensation expense (recovery)       $ 18,000,000   (33,000,000)                
Senior Notes Due 2049 - 4.350%                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount                   $ 1,250,000,000        
Coupon rate   4.35%               4.35%        
Senior Notes Due 2049 - 4.350% | Fixed interest rate                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount               $ 1,250,000,000            
Coupon rate       4.35%       4.35%            
Senior Notes Due 2049 - 3.700%                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount                 $ 1,000,000,000          
Coupon rate                 3.70%          
Hedging effect, net proceeds received from issuances $ 1,308,000,000                          
Senior Notes Due 2049 - 3.700% | Fixed interest rate                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount               $ 1,000,000,000            
Coupon rate       3.70%       3.70%            
Senior Notes Due 2048                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount                         $ 750,000,000  
Coupon rate                         4.30%  
Senior Notes Due 2048 | Fixed interest rate                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount               $ 750,000,000            
Coupon rate       4.30%       4.30%            
Senior Notes Due 2029                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount   $ 1,000,000,000                        
Coupon rate   3.25%               3.25%        
Hedging effect, net proceeds received from issuances   $ 1,000,000,000                        
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       $ 1,618,000,000       $ 1,223,000,000            
Payments to settle derivative       17,630,000,000   19,305,000,000                
Outstanding bond forwards       29,000,000                   23,000,000
Derivative financial assets outstanding       1,383,000,000   1,373,000,000                
Debt derivatives | Credit facilities                            
Disclosure of detailed information about financial instruments [line items]                            
Debt derivatives entered, notional       $ 561,000,000 $ 420,000,000 $ 157,000,000 $ 125,000,000              
Debt derivatives entered, exchange rate | $ / $       1.336 1.336 1.257 1.257              
Debt derivatives settled, notional amount       $ 564,000,000 $ 420,000,000 $ 157,000,000 $ 125,000,000              
Debt derivatives settled, exchange rate | $ / $       1.343 1.343 1.256 1.256              
Net cash received (paid)       $ 3,000,000   $ (1,000,000)                
Debt derivatives | US commercial paper                            
Disclosure of detailed information about financial instruments [line items]                            
Debt derivatives entered, notional       $ 17,127,000,000 $ 12,897,000,000 $ 19,751,000,000 $ 15,262,000,000              
Debt derivatives entered, exchange rate | $ / $       1.328 1.328 1.294 1.294              
Debt derivatives settled, notional amount       $ 17,069,000,000 $ 12,847,000,000 $ 19,148,000,000 $ 14,833,000,000              
Debt derivatives settled, exchange rate | $ / $       1.329 1.329 1.291 1.291              
Net cash received (paid)       $ (13,000,000)   $ 63,000,000                
Debt derivatives | Senior Notes Due 2049 - 4.350%                            
Disclosure of detailed information about financial instruments [line items]                            
Hedging effect, net proceeds received from issuances   $ 1,676,000,000                        
Debt derivatives | Senior Notes Due 2049 - 4.350% | Fixed interest rate                            
Disclosure of detailed information about financial instruments [line items]                            
Coupon rate   4.173%               4.173%        
Debt derivatives | Senior Notes Due 2049 - 3.700%                            
Disclosure of detailed information about financial instruments [line items]                            
Coupon rate                 3.996%          
Hedging effect, net proceeds received from issuances $ 1,308,000,000                          
Debt derivatives | Senior Notes Due 2048                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount                       $ 750,000,000    
Hedging effect, net proceeds received from issuances     $ 938,000,000     $ 938,000,000                
Debt derivatives | Senior Notes Due 2048 | Fixed interest rate                            
Disclosure of detailed information about financial instruments [line items]                            
Coupon rate                         4.193%  
Bond forwards                            
Disclosure of detailed information about financial instruments [line items]                            
Percent of derivatives designated as hedges           100.00%           100.00%    
Loss reclassified from hedging reserve           $ 21,000,000                
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]                            
Percent of derivatives designated as hedges       100.00%   100.00%   100.00%       100.00%    
Debt derivatives entered, notional       $ 1,070,000,000 $ 810,000,000 $ 896,000,000 $ 720,000,000              
Debt derivatives entered, exchange rate | $ / $       1.321 1.321 1.244 1.244              
Debt derivatives settled, notional amount       $ 1,124,000,000 $ 900,000,000 $ 1,093,000,000 $ 840,000,000              
Debt derivatives settled, exchange rate | $ / $       1.249 1.249 1.301 1.301              
Equity derivatives                            
Disclosure of detailed information about financial instruments [line items]                            
Net cash received (paid)       $ 16,000,000   $ 4,000,000                
Payments to settle derivative       $ 0   $ 0                
Weighted average price of hedging instrument | $ / shares       71.66   61.15   71.66       61.15    
Number of derivatives settled (in shares) | shares       0.7 0.7 0.4 0.4              
Fair value of derivative assets       $ 55,000,000   $ 92,000,000                
Derivative financial assets outstanding       $ 55,000,000   $ 92,000,000               68,000,000
Equity derivatives | Class B Non-Voting Shares                            
Disclosure of detailed information about financial instruments [line items]                            
Weighted average price of hedging instrument | $ / shares       51.76   51.54   51.76       51.54    
Derivative financial assets outstanding       $ 4,300,000   $ 5,000,000.0                
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            
Cash flow hedges | Debt derivatives                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount               $ 8,400,000,000       $ 6,100,000,000    
Notional amount of outstanding bond forwards       $ 3,409,000,000   736,000,000   2,570,000,000       550,000,000    
Payments to settle derivative       0   1,436,000,000                
Derivative financial assets outstanding       1,412,000,000   1,332,000,000               1,152,000,000
Cash flow hedges | Bond forwards                            
Disclosure of detailed information about financial instruments [line items]                            
Notional amount of outstanding bond forwards           900,000,000                
Payments to settle derivative       111,000,000   0                
Outstanding bond forwards       0   87,000,000               64,000,000
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]                            
Notional amount               990,000,000       $ 1,080,000,000    
Notional amount of outstanding bond forwards       952,000,000       $ 720,000,000            
Payments to settle derivative       $ 1,124,000,000   $ 1,093,000,000                
Outstanding bond forwards                           $ 39,000,000
Average foreign exchange rate | $ / $       1.300 1.300 1.241 1.241              
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 | $ / $       1.30 1.30