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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
investment
Jun. 30, 2023
USD ($)
investment
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 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) $ 15 $ (16) $ 70 $ (21)        
Transitional real estate loan commitments 400   400          
Middle market loan program unfunded amount 25   25     $ 24    
Middle market loan commitments 741   741          
Other loans commitments 5   5          
Amortized Cost 15,690   15,690     17,824    
Limited partnerships investment commitments $ 2,100   $ 2,100          
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 $ 4,000   $ 4,000     4,300    
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   0     0    
Nonaccrual loans, interest income 0     0        
Credit allowance 238   238     274    
Financing receivable, before allowance for credit loss 12,033   12,033     12,801    
Real estate owned, held-and-used           210    
Real estate owned, held-for-sale           17    
Depreciation expense 3   4          
Accumulated depreciation 4   4          
Transitional real estate loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance $ 68   $ 68     160    
Percent of total financing receivables 2.00%   6.00%          
Amortized cost of financing receivable modified $ 121   $ 332          
Credit allowance 123 76 123 76 $ 114 112 $ 65 $ 54
Financing receivable, before allowance for credit loss $ 5,669   $ 5,669     6,114    
Financing Receivable Modified Weighted Average Interest Rate Before Modification 8.10%   8.20%          
Financing Receivable Modified Weighted Average Interest Rate After Modification 7.80%   7.30%          
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure                
Schedule of Investments [Line Items]                
Credit allowance $ 33   $ 33          
Financing receivable, before allowance for credit loss 656   656          
Financing Receivable in Process of Foreclosure, Amount 267   267          
Middle market loans                
Schedule of Investments [Line Items]                
Nonaccrual loans, no allowance $ 4   $ 4     0    
Percent of total financing receivables 0.00%   0.00%          
Financing receivable, modified, increase (decrease) from modification $ 15   $ 15          
Amortized cost of financing receivable modified 2   2          
Credit allowance 98 $ 140 98 $ 140 $ 99 146 $ 149 $ 129
Financing receivable, before allowance for credit loss 4,489   4,489     $ 4,677    
Zero-credit-loss expectation | Japan government and agencies                
Schedule of Investments [Line Items]                
Amortized Cost $ 14,900   $ 14,900          
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     9.00%