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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
investment
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Schedule of Investments [Line Items]      
Held to maturity securities transferred to available for sale securities, number of investments | investment 0    
Equity securities, FV-NI, unrealized gain (loss) $ (77)    
Available for sale, fixed maturity securities, allowance for credit losses 27 $ 38  
Transitional real estate loan commitments 515    
Commercial mortgage loan commitments 104    
Middle market loan program unfunded amount 29 25  
Middle market loan commitments 1,800    
Securities held to maturity, fixed maturities, amortized cost 22,876 24,474  
Loan Commitments, Allowance for Credit Loss 30    
Limited partnerships investment commitments $ 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%    
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 $ 7,475 $ 6,654  
Financing Receivable, Troubled Debt Restructuring 0    
Accounting Standards Update 2019-04      
Schedule of Investments [Line Items]      
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Reclassification From Held To Maturity To Available For Sale Debt Securities     $ 6,900
New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Unrealized Gain Loss Net Of Tax Reclassification To Accumulated Other Comprehensive Income     $ 848
Zero-credit-loss expectation | Japan government and agencies      
Schedule of Investments [Line Items]      
Securities held to maturity, fixed maturities, amortized cost $ 21,700    
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 21.00%    
TEXAS | Commercial Mortgage and Transitional Real Estate Loans      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 11.00%    
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 9.00%