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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 6 Months Ended
Feb. 22, 2024
USD ($)
Feb. 22, 2024
CAD ($)
Jun. 30, 2025
USD ($)
Jun. 05, 2025
USD ($)
May 16, 2025
CAD ($)
Mar. 16, 2025
CAD ($)
Dec. 31, 2024
USD ($)
Nov. 29, 2024
USD ($)
May 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]                  
Commercial paper     $ 295            
Corporate revolving credit facility                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity     $ 2,200            
Line of credit facility, unused capacity, commitment fee percentage     0.0013            
Subsidiary and corporate borrowings     $ 113       $ 300    
Letter of credit outstanding amount     10       10    
Line of credit amount drawn     $ 187            
Corporate revolving credit facility | Floating interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     1.30%            
Subordinated notes, maturing september 1, 2055                  
Disclosure of detailed information about borrowings [line items]                  
Subsidiary and corporate borrowings     $ 184     $ 250 0    
Notional amount         $ 250        
Subordinated notes, maturing september 1, 2055 | Floating interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings variable rate         0.027        
Subordinated notes, maturing september 1, 2055 | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate     5.60%   5.60%        
Subordinated notes maturing march                  
Disclosure of detailed information about borrowings [line items]                  
Subsidiary and corporate borrowings               $ 300  
Notional amount               $ 300  
Subordinated notes maturing march | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate               6.80%  
Subordinated notes, maturing may 31, 2084                  
Disclosure of detailed information about borrowings [line items]                  
Subsidiary and corporate borrowings     $ 158 $ 158     158   $ 158
Subordinated notes, maturing may 31, 2084 | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate       7.30%         7.30%
Medium-term notes, public - canadian - maturing february 22, 2024                  
Disclosure of detailed information about borrowings [line items]                  
Repayments of debt $ 531 $ 700              
Medium-term notes, public - canadian - maturing february 22, 2024 | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Borrowings, interest rate 3.315% 3.315%              
Revolving credit facility with brookfield                  
Disclosure of detailed information about borrowings [line items]                  
Credit facility, maximum borrowing capacity     1,000            
Subsidiary and corporate borrowings     $ 0       $ 0    
Borrowing renewal term     1 year            
Borrowings, adjustment to interest rate basis     1.90%            
Subordinate notes                  
Disclosure of detailed information about borrowings [line items]                  
Notional amount     $ 184