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DISPOSITION OF BUSINESSES (Details) - USD ($)
$ in Millions
Nov. 16, 2021
Jun. 07, 2021
May 12, 2021
Chilean toll roads      
Disclosure of subsidiaries [line items]      
Disposal of ownership interest, percentage 17.00%    
Total consideration $ 165    
Gain (Loss) on disposition of business 140    
Reclassification adjustments on exchange differences on translation, net of tax $ 8    
Chilean toll roads | Consortium      
Disclosure of subsidiaries [line items]      
Disposal of ownership interest, percentage 34.00%    
Total consideration $ 315    
Gain (Loss) on disposition of business $ 270    
Canadian district energy operations      
Disclosure of subsidiaries [line items]      
Disposal of ownership interest, percentage   40.00%  
Gain (Loss) on disposition of business   $ 425  
Proceeds from disposition of subsidiary   555  
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity   $ 150  
Canadian District Energy Operation      
Disclosure of subsidiaries [line items]      
Disposal of ownership interest, percentage   25.00%  
Gain (Loss) on disposition of business   $ 295  
Reclassification adjustments on exchange differences on translation, net of tax   9  
Proceeds from disposition of subsidiary   450  
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity   124  
Canadian District Energy Operation | Consortium      
Disclosure of subsidiaries [line items]      
Total consideration   1,800  
Gain (Loss) on disposition of business   $ 1,200  
U.K. Regulated Distribution Operation      
Disclosure of subsidiaries [line items]      
Total consideration     $ 820
Gain (Loss) on disposition of business     155
Reclassification adjustments on exchange differences on translation, net of tax     12
Proceeds from disposition of subsidiary     195
Increase (decrease) through transfer between revaluation surplus and retained earnings, equity     142
U.K. Regulated Distribution Operation | Consortium      
Disclosure of subsidiaries [line items]      
Proceeds from disposition of subsidiary     $ 340