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BORROWINGS - Additional Information (Details)
$ in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Apr. 21, 2022
USD ($)
May 24, 2021
USD ($)
Jun. 30, 2022
USD ($)
extension
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
extension
Jun. 30, 2021
USD ($)
Apr. 21, 2022
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]                
Proceeds from corporate credit facility     $ 1,245 $ 1,539 $ 2,202 $ 1,830    
Proceeds from corporate borrowings     474 244 474 244    
(Repayment of) net proceeds from commercial paper program     (124) 406 (164) 496    
Corporate Revolving Credit Facility                
Disclosure of detailed information about borrowings [line items]                
Credit facility, maximum borrowing capacity     $ 2,100   $ 2,100      
Line of credit facility, unused capacity, commitment fee percentage     13   13      
Subsidiary and corporate borrowings     $ 508   $ 508     $ 0
Letter of credit outstanding amount     $ 15   15     12
Proceeds from corporate credit facility         $ 508      
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     $ 544   $ 544     554
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 | Floating interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, adjustment to interest rate basis     1.80%   1.80%      
Medium-term Notes, Maturing October 9, 2029                
Disclosure of detailed information about borrowings [line items]                
Subsidiary and corporate borrowings     $ 544   $ 544     554
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     $ 311   $ 311     0
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     $ 388   $ 388     396
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     $ 267   $ 267     $ 431
Commercial paper program, maximum borrowing capacity     $ 500   500      
(Repayment of) net proceeds from commercial paper program         $ 164      
Commercial Paper | Fixed interest rate                
Disclosure of detailed information about borrowings [line items]                
Borrowings, interest rate     1.90%   1.90%      
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