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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2025
USD ($)
investment
Mar. 31, 2024
USD ($)
investment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
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) $ 55 $ 71    
Transitional real estate loan commitments 245      
Middle market loan commitments 664      
Other Loans Commitments 1      
Nonaccrual loans, interest income 1      
Financing Receivable, Modified, Commitment to Lend 5   $ 14  
Amortized Cost 16,893   15,971  
Credit allowance 368   355  
REO, accumulated depreciation 20   14  
Limited partnerships investment commitments $ 2,600   2,800  
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%      
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%      
Securities Lending, Securities Received as Collateral $ 1,300   3,000  
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   0  
Financing receivable, before allowance for credit loss 11,024   11,224  
Variable Interest Entity, Not Consolidated        
Schedule of Investments [Line Items]        
Limited partnerships investment commitments 2,000   2,100  
Real estate owned        
Schedule of Investments [Line Items]        
Depreciation 6 1    
Transitional real estate loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 146   140  
Credit allowance 203 114 199 $ 112
Financing receivable, before allowance for credit loss 4,678   4,902  
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure        
Schedule of Investments [Line Items]        
Mortgage Loans in Process of Foreclosure, Amount 311      
Credit allowance 25      
Middle market loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 20   5  
Credit allowance 150 $ 99 140 $ 146
Financing receivable, before allowance for credit loss 4,451   $ 4,423  
Zero-credit-loss expectation | Japan government and agencies        
Schedule of Investments [Line Items]        
Amortized Cost $ 16,100      
CALIFORNIA | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 21.00%      
TEXAS | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 14.00%      
FLORIDA | Geographic Concentration Risk | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 10.00%