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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 25, 2022
USD ($)
May 24, 2021
USD ($)
Jun. 30, 2023
USD ($)
extension
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
extension
Jun. 30, 2022
USD ($)
Jul. 27, 2023
CAD ($)
Dec. 31, 2022
USD ($)
Nov. 14, 2022
CAD ($)
Apr. 25, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]                    
Proceeds from corporate credit facility     $ 1,268 $ 1,245 $ 3,057 $ 2,202        
Proceeds from corporate borrowings     0 474 0 474        
Net proceeds from (repayment of) commercial paper program     225 (124) 477 (164)        
Corporate Revolving Credit Facility                    
Disclosure of detailed information about borrowings [line items]                    
Credit facility, maximum borrowing capacity     $ 2,200   $ 2,200          
Line of credit facility, unused capacity, commitment fee percentage     13   13          
Subsidiary and corporate borrowings     $ 577   $ 577     $ 96    
Letter of credit outstanding amount     $ 11   11     12    
Proceeds from corporate credit facility         $ 481          
Corporate Revolving Credit Facility | Floating interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     1.20%   1.20%          
Medium-term Notes, Maturing September 11, 2028                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 529   $ 529     517    
Medium-term Notes, Maturing September 11, 2028 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     4.20%   4.20%          
Revolving credit facility with Brookfield                    
Disclosure of detailed information about borrowings [line items]                    
Credit facility, maximum borrowing capacity     $ 1,000   $ 1,000          
Subsidiary and corporate borrowings     $ 0 $ 0 $ 0 $ 0   0    
Borrowings, number of extensions | extension     8   8          
Revolving credit facility with Brookfield | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, adjustment to interest rate basis     1.90%   1.90%          
Medium-term Notes, Maturing October 9, 2029                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 529   $ 529     517    
Medium-term Notes, Maturing October 9, 2029 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     3.40%   3.40%          
Subordinated Notes, Maturing May 24, 2081                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 250   $ 250     250    
Subordinated Notes, Maturing May 24, 2081 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     5.00%   5.00%          
Medium-term Notes, Maturing April 25, 2034                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 302   $ 302     295    
Notional amount                   $ 600
Finance costs $ 3                  
Medium-term Notes, Maturing April 25, 2034 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     5.40%   5.40%          
Medium-term Notes, Maturing April 25, 2034 Tranche One                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount                   $ 400
Medium-term Notes, Maturing April 25, 2034 Tranche One | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate                   5.439%
Medium-term Notes, Maturing April 25, 2034 Tranche Two                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount                   $ 200
Medium-term Notes, Maturing April 25, 2034 Tranche Two | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate                   5.789%
Medium-term Notes, Maturing September 1, 2032                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 378   $ 378     369    
Medium-term Notes, Maturing September 1, 2032 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     2.90%   2.90%          
Commercial Paper                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 941   $ 941     464    
Commercial paper program, maximum borrowing capacity     $ 1,000   $ 1,000          
Commercial Paper | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     6.00%   6.00%          
Subordinated notes, Maturing May 24, 2081                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate   5.00%                
Subsidiary and corporate borrowings   $ 250                
Finance costs   $ 6                
Medium-term Notes, Maturing July 27, 2030 | Entering into significant commitments or contingent liabilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount             $ 700      
Medium-term Notes, Maturing July 27, 2030, Tranche One | Entering into significant commitments or contingent liabilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount             $ 500      
Medium-term Notes, Maturing July 27, 2030, Tranche One | Fixed interest rate | Entering into significant commitments or contingent liabilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate             5.71%      
Medium-term Notes, Maturing July 27, 2030, Tranche Two | Entering into significant commitments or contingent liabilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount             $ 200      
Medium-term Notes, Maturing July 27, 2030, Tranche Two | Fixed interest rate | Entering into significant commitments or contingent liabilities [member]                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate             5.95%      
Medium-term Notes, Maturing November 14, 2027                    
Disclosure of detailed information about borrowings [line items]                    
Subsidiary and corporate borrowings     $ 340   $ 340     $ 332    
Notional amount                 $ 700  
Medium-term Notes, Maturing November 14, 2027 | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate     5.60%   5.60%          
Medium-term Notes, Maturing November 14, 2027 Tranche One                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount                 $ 450  
Medium-term Notes, Maturing November 14, 2027 Tranche One | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate                 5.616%  
Medium-term Notes, Maturing November 14, 2027 Tranche Two                    
Disclosure of detailed information about borrowings [line items]                    
Notional amount                 $ 250  
Medium-term Notes, Maturing November 14, 2027 Tranche Two | Fixed interest rate                    
Disclosure of detailed information about borrowings [line items]                    
Borrowings, interest rate                 5.98%