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SHARE CAPITAL - Narrative (Details)
$ / shares in Units, $ in Millions
 6 Months Ended
May 25, 2022
USD ($)
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
$ / shares
Dec. 31, 2021
USD ($)
shares
Disclosure of classes of share capital [line items]          
Equity | $   $ 4,405     $ 1,499
Issuance of common equity | $   $ 450 $ 1,160    
Class A exchangeable shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   1,000,000,000      
Par value per share (USD/CAD per share) | $ / shares   $ 39.74      
Number of shares issued (in shares)   10,877,989     10,877,989
Equity | $   $ 532     $ 535
Class B Limited Voting Shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   500,000      
Par value per share (USD/CAD per share) | $ / shares   $ 39.74      
Class C Non-Voting Shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   1,000,000,000      
Par value per share (USD/CAD per share) | $ / shares   $ 1      
Class A Senior Preferred Shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   100,000,000      
Par value per share (USD/CAD per share) | $ / shares   $ 25      
Class B Senior Preferred Shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   100,000,000      
Par value per share (USD/CAD per share) | $ / shares       $ 25  
Class A Junior Preferred shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   1,000,000,000      
Par value per share (USD/CAD per share) | $ / shares   $ 25      
Number of shares issued (in shares) 98,351,547 98,351,547     0
Equity | $   $ 2,459     $ 0
Issuance of common equity | $ $ 2,500        
Class B Junior Preferred Shares          
Disclosure of classes of share capital [line items]          
Number of shares authorized (in shares)   1,000,000,000      
Par value per share (USD/CAD per share) | $ / shares       $ 25  
Class C shares          
Disclosure of classes of share capital [line items]          
Number of shares issued (in shares) 11,270,466 34,815,014     23,544,548
Equity | $   $ 1,413     $ 963
Issuance of common equity | $ $ 450