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SUBSIDIARIES (Details)
12 Months Ended
Dec. 07, 2020
Dec. 31, 2021
Dec. 31, 2020
Nov. 16, 2021
Jul. 06, 2021
Jun. 07, 2021
Australian rail operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   100.00% 100.00%      
U.K. regulated distribution operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   80.00% 80.00%      
Voting interest (%)   80.00% 80.00%      
Canadian District Energy Operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   0.00% 25.00%      
Voting interest (%)   0.00% 100.00%      
Disposal of ownership interest, percentage           25.00%
U.S. district energy operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   0.00% 40.00%      
Voting interest (%)   0.00% 100.00%      
Disposal of ownership interest, percentage           40.00%
Brazilian regulated gas transmission operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   31.00% 28.00%      
Voting interest (%)   92.00% 90.00%      
Colombian natural gas distribution operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   21.00% 21.00%      
Voting interest (%)   75.00% 75.00%      
Brazilian electricity transmission operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   31.00% 31.00%      
Voting interest (%)   100.00% 100.00%      
European residential infrastructure operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   11.00% 0.00%      
Voting interest (%)   51.00% 0.00%      
North American residential energy infrastructure operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   30.00% 30.00%      
Voting interest (%)   100.00% 100.00%      
Disposal of ownership interest, percentage         40.00%  
Indian gas transmission operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   23.00% 24.00%      
Voting interest (%)   80.00% 83.00%      
UK Residential Infrastructure Business            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   15.00% 0.00%      
Voting interest (%)   60.00% 0.00%      
Australian Export Terminal            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary 49.00%          
Disposal of ownership interest, percentage 22.00%          
North American rail operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   9.00% 9.00%      
Voting interest (%)   72.00% 72.00%      
U.K. ports operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   59.00% 59.00%      
Voting interest (%)   100.00% 100.00%      
Australian port operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   27.00% 27.00%      
Voting interest (%)   67.00% 67.00%      
Chilean toll roads            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   0.00% 17.00%      
Voting interest (%)   0.00% 60.00%      
Disposal of ownership interest, percentage       17.00%    
Indian toll roads            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   40.00% 40.00%      
Voting interest (%)   93.00% 93.00%      
Peruvian toll roads            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   17.00% 17.00%      
Voting interest (%)   57.00% 57.00%      
Indian toll roads - Simhapuri Expressway Limited            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   29.00% 29.00%      
Voting interest (%)   93.00% 93.00%      
Indian roll roads - Rayalseema Expressway Limited            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   26.00% 26.00%      
Voting interest (%)   84.00% 84.00%      
North American gas storage - Warwick Gas Storage L.P.            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   25.00% 25.00%      
Voting interest (%)   100.00% 100.00%      
North American gas storage operation - Lodi Gas Storage            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   40.00% 40.00%      
Voting interest (%)   100.00% 100.00%      
North American gas storage operation - Rockpoint Gas Storage Partners L.P.            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   40.00% 40.00%      
Voting interest (%)   100.00% 100.00%      
Canadian diversified midstream operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   59.00% 0.00%      
Voting interest (%)   100.00% 0.00%      
Western Canadian natural gas gathering and processing operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   29.00% 29.00%      
Voting interest (%)   100.00% 100.00%      
U.S. data center operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   29.00% 29.00%      
Voting interest (%)   100.00% 100.00%      
Australian data center operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   29.00% 29.00%      
Voting interest (%)   100.00% 100.00%      
Indian Telecom Towers Operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   17.00% 17.00%      
Voting interest (%)   62.00% 62.00%      
U.K. telecom towers operation            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   24.00% 25.00%      
Voting interest (%)   98.00% 100.00%      
Holding LP            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest in subsidiary   70.00% 70.00%      
Voting interest (%)   100.00% 100.00%