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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Sep. 24, 2025
CAD ($)
May 16, 2025
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Commercial paper $ 268      
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 $ 700 $ 0    
Letter of credit outstanding amount $ 11 11    
Corporate revolving credit facility | Floating interest rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 1.20%      
Medium-term notes, maturing january 6, 2031        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 264 273 $ 375  
Medium-term notes, maturing january 6, 2031 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.70%   3.70%  
Medium-term notes, maturing september 24, 2035        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 229 237 $ 325  
Medium-term notes, maturing september 24, 2035 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.50%   4.50%  
Subordinated notes, maturing september 1, 2055        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 177 183   $ 250
Subordinated notes, maturing september 1, 2055 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 5.60%     5.60%
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%