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BORROWINGS - Corporate Borrowings (Details)
$ in Millions, $ in Millions
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Sep. 24, 2025
CAD ($)
May 16, 2025
CAD ($)
Corporate revolving credit facility        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 700 $ 0    
Corporate revolving credit facility | Floating interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 1.20%      
Commercial paper        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 467 735    
Commercial paper | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 4.10%      
Medium-term notes, maturing november 14, 2027        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 317 328    
Medium-term notes, maturing november 14, 2027 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 5.60%      
Medium-term notes, maturing september 11, 2028        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 493 510    
Medium-term notes, maturing september 11, 2028 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 4.20%      
Medium-term notes, maturing october 9, 2029        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 493 510    
Medium-term notes, maturing october 9, 2029 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 3.40%      
Medium-term notes, maturing july 27, 2030        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 352 364    
Medium-term notes, maturing july 27, 2030 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 5.70%      
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]        
Annual Rate 3.70%   3.70%  
Medium-term notes, maturing september 1, 2032        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 352 364    
Medium-term notes, maturing september 1, 2032 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 2.90%      
Medium-term notes, maturing february 14, 2033        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 176 182    
Medium-term notes, maturing february 14, 2033 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 6.00%      
Medium-term notes, maturing april 25, 2034        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 281 291    
Medium-term notes, maturing april 25, 2034 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 5.40%      
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]        
Annual Rate 4.50%   4.50%  
Medium-term notes, maturing april 25, 2052        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 141 146    
Medium-term notes, maturing april 25, 2052 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 5.80%      
Medium-term notes, maturing july 27, 2053        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 141 146    
Medium-term notes, maturing july 27, 2053 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 6.00%      
Subordinated notes, maturing march 15, 2055        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 300 300    
Subordinated notes, maturing march 15, 2055 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 6.80%      
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]        
Annual Rate 5.60%     5.60%
Subordinated notes, maturing may 24, 2081        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 250 250    
Subordinated notes, maturing may 24, 2081 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 5.00%      
Subordinated notes, maturing may 31, 2084        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 158 158    
Subordinated notes, maturing may 31, 2084 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual Rate 7.30%      
Corporate borrowings        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 5,263 4,947    
Corporate borrowings, outstanding principal 5,291 4,977    
Corporate borrowings, deferred financing costs and other $ (28) $ (30)