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BORROWINGS - Corporate Borrowings (Details)
$ in Millions, $ in Millions
Jun. 30, 2025
USD ($)
Jun. 05, 2025
USD ($)
May 16, 2025
Mar. 16, 2025
CAD ($)
Dec. 31, 2024
USD ($)
May 31, 2024
USD ($)
Corporate revolving credit facility            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings $ 113       $ 300  
Corporate revolving credit facility | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Annual rate 1.30%          
Commercial paper            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings $ 1,145       850  
Commercial paper | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Annual rate 4.90%          
Medium-term notes, maturing november 14, 2027            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings $ 331       313  
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 $ 515       487  
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 $ 515       487  
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 $ 367       348  
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 september 1, 2032            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings $ 367       348  
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 $ 184       174  
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 $ 294       278  
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 april 25, 2052            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings $ 147       139  
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 $ 147       139  
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 $ 184     $ 250 0  
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     158 $ 158
Subordinated notes, maturing may 31, 2084 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Annual rate   7.30%       7.30%
Corporate borrowings            
Disclosure of detailed information about borrowings [line items]            
Subsidiary and corporate borrowings 4,988       4,542  
Corporate borrowings, outstanding principal 5,017       4,571  
Corporate borrowings, deferred financing costs and other $ (29)       $ (29)