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BORROWINGS - Corporate Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2024
May 31, 2024
Feb. 22, 2024
Dec. 31, 2023
Corporate Revolving Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 865     $ 222
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 $ 986     989
Commercial Paper | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual rate 6.00%      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 0     226
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual rate 3.30%      
Medium Term Notes, Public - Canadian - Maturing February 22, 2024        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 0     302
Medium Term Notes, Public - Canadian - Maturing February 22, 2024 | Fixed interest rate        
Disclosure of detailed information about borrowings [line items]        
Annual rate 3.30%   3.315%  
Medium-term Notes, Maturing November 14, 2027        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 329     340
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 $ 512     528
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 $ 512     528
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 $ 366     377
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 $ 366     377
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 $ 183     189
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 $ 292     302
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 $ 146     151
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 $ 146     151
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 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%      
Medium-term Notes, Maturing May 31, 2084        
Disclosure of detailed information about borrowings [line items]        
Subsidiary and corporate borrowings $ 158 $ 158   0
Medium-term 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 5,084     4,911
Corporate borrowings, outstanding principal 5,111     4,932
Corporate borrowings, deferred financing costs and other $ (27)     $ (21)