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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2023
USD ($)
investment
Mar. 31, 2022
USD ($)
investment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
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) $ (5)      
Transitional real estate loan commitments 709      
Middle market loan program unfunded amount 21   $ 28  
Middle market loan commitments 748      
Held to maturity, fixed maturity securities, amortized cost 18,942   19,063  
Loan Commitments, Allowance for Credit Loss 21      
Limited partnerships investment commitments $ 2,000      
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%      
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 $ 5,900   6,800  
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   0  
Credit allowance 223   192  
Total Financing Receivable 13,551   13,688  
Transitional real estate loans        
Schedule of Investments [Line Items]        
Credit allowance 65 $ 52 54 $ 68
Total Financing Receivable 6,700   $ 6,509  
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure [Member]        
Schedule of Investments [Line Items]        
Amortized cost of financing receivable in anticipation of foreclosure 521      
Credit allowance 10      
Total Financing Receivable 345      
Zero-credit-loss expectation | Japan government and agencies        
Schedule of Investments [Line Items]        
Held to maturity, fixed maturity securities, amortized cost $ 18,000      
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 20.00%      
TEXAS | Commercial Mortgage and Transitional Real Estate Loans | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 12.00%      
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 10.00%