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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
investment
Jun. 30, 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) $ (137) $ (294)    
Transitional real estate loan commitments 763 763    
Commercial mortgage loan commitments 0 0    
Middle market loan program unfunded amount 15 15   $ 11
Middle market loan commitments 1,200 1,200    
Held to maturity, fixed maturity securities, amortized cost 18,514 18,514   22,008
Loan Commitments, Allowance for Credit Loss 30 30    
Limited partnerships investment commitments $ 1,600 $ 1,600    
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 $ 5,700 $ 5,700   6,800
Financing Receivable, Troubled Debt Restructuring 0 0 $ 0  
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding 0 0   $ 0
Zero-credit-loss expectation | Japan government and agencies        
Schedule of Investments [Line Items]        
Held to maturity, fixed maturity securities, amortized cost $ 17,600 $ 17,600    
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%