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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
investment
Mar. 31, 2021
USD ($)
investment
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) $ 157    
Available for sale, fixed maturity securities, allowance for credit losses 0   $ 0
Transitional real estate loan commitments 693    
Commercial mortgage loan commitments 0    
Middle market loan program unfunded amount 16   11
Middle market loan commitments 1,200    
Securities held to maturity, fixed maturities, amortized cost 20,680   22,008
Loan Commitments, Allowance for Credit Loss 24    
Limited partnerships investment commitments $ 1,700    
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 $ 7,000   6,800
Financing Receivable, Troubled Debt Restructuring 0 $ 0  
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0   $ 0
Zero-credit-loss expectation | Japan government and agencies      
Schedule of Investments [Line Items]      
Securities held to maturity, fixed maturities, amortized cost $ 19,700    
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 22.00%    
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 9.00%