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INVESTMENTS - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
investment
Dec. 31, 2022
USD ($)
investment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
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) $ 63 $ (340) $ 141  
Transitional real estate loan commitments 488      
Middle market loan program unfunded amount 24 28    
Middle market loan commitments 820      
Nonaccrual loans, interest income 0      
Securities held to maturity, fixed maturities, amortized cost 17,824 19,063    
Financing receivable, allowance for credit loss 274 192    
Financing receivable, before allowance for credit loss 12,801 13,688    
Real estate owned, held-for-sale 17      
Real estate owned, held-and-used 210      
Other investments 4,530 4,070    
Limited partnerships investment commitments $ 2,300      
Percentage that the lending policy requires that the fair value of the securities and/or unrestricted cash 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 received as collateral $ 4,300 6,800    
Repurchase agreements and repurchase to maturity transactions outstanding 0 0    
Fair value of debt securities on deposit with regulatory authorities in the United States and Japan 20      
Available for sale, fixed maturity securities, amortized cost 70,689 75,469    
Available-for-sale, allowance for credit losses 0 0    
Real estate owned        
Schedule of Investments [Line Items]        
Other investments 227 0    
Transitional real estate loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 160      
Amortized cost of foreclosure or deed in lieu foreclosure 284      
Real estate owned, amount of loss at acquisition (66)      
Financing receivable, before allowance for credit loss 6,114      
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure        
Schedule of Investments [Line Items]        
Amortized cost of financing receivable in anticipation of foreclosure 502      
Financing receivable, allowance for credit loss 55      
Financing receivable, before allowance for credit loss 600      
Middle market loans        
Schedule of Investments [Line Items]        
Nonaccrual loans, no allowance 0      
Financing receivable, before allowance for credit loss $ 4,677      
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 12.00%      
Florida | Commercial mortgage and transitional real estate loans | Mortgages        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 11.00%      
Commercial mortgage loans        
Schedule of Investments [Line Items]        
Financing receivable, allowance for credit loss $ 16 9 $ 10 $ 32
Financing receivable, before allowance for credit loss 1,709 $ 1,784    
Japan government and agencies | Zero-credit-loss expectation        
Schedule of Investments [Line Items]        
Securities held to maturity, fixed maturities, amortized cost $ 16,900