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INVESTMENTS - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
investment
Sep. 30, 2023
USD ($)
investment
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Schedule of Investments [Line Items]                
Held to maturity securities transferred to available for sale securities, number of investments | investment     0 0        
Equity securities, FV-NI, unrealized gain (loss) $ 34 $ 47 $ 79 $ 13        
Transitional real estate loan commitments 362   362          
Middle market loan program unfunded amount 21   21     $ 24    
Middle market loan commitments 680   680          
Other loans commitments 1   1          
Nonaccrual loans, interest income 0 0 0 0        
Financing Receivable, Modified, Commitment to Lend 6   6          
Amortized Cost 17,703   17,703     17,824    
Credit allowance 284   284     274    
Real estate owned, held-and-used           210    
Real estate owned, held-for-sale           17    
Accumulated depreciation 9   9          
Limited partnerships investment commitments $ 3,000   $ 3,000          
Percentage that the lending policy requires that the fair value of the securities received as collateral be of the fair value of the loaned securities 102.00%   102.00%          
Percentage that the lending policy requires that the fair value of the unrestricted cash received as collateral be of the fair value of the loaned securities 100.00%   100.00%          
Securities Lending, Securities Received as Collateral $ 3,300   $ 3,300     4,300    
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   0     0    
Real estate owned                
Schedule of Investments [Line Items]                
Depreciation 4   8          
Potential Foreclosure or Deed-in-lieu Foreclosure                
Schedule of Investments [Line Items]                
Credit allowance 33   33          
Transitional real estate loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance 202   202     160    
Credit allowance 151 111 151 111 $ 123 112 $ 76 $ 54
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure                
Schedule of Investments [Line Items]                
Financing Receivable in Process of Foreclosure, Amount 198   198          
Middle market loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance 5   5     0    
Credit allowance 103 137 103 137 98 146 140 129
Commercial mortgage loans                
Schedule of Investments [Line Items]                
Credit allowance 30 $ 12 30 $ 12 $ 17 $ 16 $ 9 $ 9
Commercial mortgage loans | Potential Foreclosure or Deed-in-lieu Foreclosure                
Schedule of Investments [Line Items]                
Financing Receivable in Process of Foreclosure, Amount 28   28          
Zero-credit-loss expectation | Japan government and agencies                
Schedule of Investments [Line Items]                
Amortized Cost $ 16,800   $ 16,800          
California | Commercial Mortgage and Transitional Real Estate Loans | Mortgages                
Schedule of Investments [Line Items]                
Concentration Risk, Percentage     21.00%          
Texas | Commercial Mortgage and Transitional Real Estate Loans | Mortgages                
Schedule of Investments [Line Items]                
Concentration Risk, Percentage     13.00%          
Florida | Commercial Mortgage and Transitional Real Estate Loans | Mortgages                
Schedule of Investments [Line Items]                
Concentration Risk, Percentage     10.00%