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BORROWINGS - Additional Information (Details)
$ in Millions
 12 Months Ended
Sep. 01, 2020
CAD ($)
Nov. 06, 2019
CAD ($)
Oct. 30, 2018
CAD ($)
Dec. 31, 2020
USD ($)
Feb. 24, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Apr. 14, 2020
USD ($)
Apr. 07, 2020
CAD ($)
Dec. 31, 2019
USD ($)
Oct. 07, 2019
CAD ($)
Sep. 10, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]                      
Notional Amount (U.S. Dollars)       $ 14,743,000,000         $ 15,855,000,000    
Indian telecom towers operation                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       3,500,000,000              
Corporate revolving credit facility                      
Disclosure of detailed information about borrowings [line items]                      
Credit facility, maximum borrowing capacity       $ 1,975,000,000              
Basis points       0.0013   0.0013          
Non-recourse borrowings       $ 1,131,000,000         820,000,000    
Letter of credit outstanding amount       63,000,000         54,000,000    
Increase (decrease) in corporate borrowings       $ 311,000,000              
Corporate revolving credit facility | Floating interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis       1.20%   1.20%          
Commercial Paper Program | Establishment of Commercial Paper Program                      
Disclosure of detailed information about borrowings [line items]                      
Commercial papers issued         $ 500,000,000            
Syndicated Revolving Credit Facility                      
Disclosure of detailed information about borrowings [line items]                      
Credit facility, maximum borrowing capacity       $ 1,000,000,000.0     $ 1,000,000,000.0        
Syndicated Revolving Credit Facility | Bottom of range                      
Disclosure of detailed information about borrowings [line items]                      
Basis points             0.0042        
Syndicated Revolving Credit Facility | Top of range                      
Disclosure of detailed information about borrowings [line items]                      
Basis points             0.0044        
Syndicated Revolving Credit Facility | Floating interest rate | Bottom of range                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis             2.10%        
Syndicated Revolving Credit Facility | Floating interest rate | Top of range                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis             2.20%        
Medium-term Notes, Maturing October 9, 2029                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       $ 550,000,000         386,000,000    
Notional Amount (U.S. Dollars)               $ 200   $ 500  
Borrowings, interest rate               3.40%   3.50%  
Borrowings, effective interest rate               4.10%      
Medium-term Notes, Maturing October 9, 2029 | Debt Issuers                      
Disclosure of detailed information about borrowings [line items]                      
Amount repaid   $ 375                  
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate       3.40%   3.40%          
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate | Debt Issuers | CAD                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate               3.40%   3.40%  
Medium Term Notes, Maturing October 30, 2018 | Debt Issuers                      
Disclosure of detailed information about borrowings [line items]                      
Amount repaid     $ 125                
Medium Term Notes                      
Disclosure of detailed information about borrowings [line items]                      
Notional Amount (U.S. Dollars)           $ 900   $ 400      
Medium-term Notes, Maturing September 11, 2028                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       $ 550,000,000         384,000,000    
Notional Amount (U.S. Dollars)               $ 200     $ 500
Borrowings, effective interest rate               4.10%      
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate       4.20%   4.20%          
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | CAD                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate               4.20%     4.20%
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate | Debt Issuers | USD                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate                     4.70%
Corporate borrowings                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       $ 3,173,000,000         2,475,000,000    
Increase (decrease) in corporate borrowings       698,000,000              
Revolving credit facility with Brookfield                      
Disclosure of detailed information about borrowings [line items]                      
Credit facility, maximum borrowing capacity       500,000,000              
Non-recourse borrowings       $ 0         0    
Revolving credit facility with Brookfield | Floating interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, adjustment to interest rate basis       1.80%   1.80%          
Commitment fees       $ 0              
Non-recourse borrowings                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       20,020,000,000         18,544,000,000    
Increase in borrowings       1,500,000,000              
Non-recourse borrowings | CAD                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       2,400,000,000         2,473,000,000    
Non-recourse borrowings | USD                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       7,457,000,000         7,801,000,000    
Medium-term Notes, Maturing September 1, 2032                      
Disclosure of detailed information about borrowings [line items]                      
Non-recourse borrowings       $ 392,000,000         $ 0    
Notional Amount (U.S. Dollars) $ 500                    
Amount repaid $ 450                    
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate       2.90%   2.90%          
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | CAD                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate 2.90%                    
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate | Debt Issuers | USD                      
Disclosure of detailed information about borrowings [line items]                      
Borrowings, interest rate 3.90%