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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
investment
Jan. 01, 2020
USD ($)
Dec. 31, 2019
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) $ 149      
Available for sale, fixed maturity securities, allowance for credit losses 63      
Transitional real estate loan commitments 838      
Commercial mortgage loan commitments 10      
Middle market loan program unfunded amount 0     $ 99
Middle market loan commitments 2,600      
Middle Market Loan Commitment Increase During Period 2,200      
Securities held to maturity, fixed maturities, amortized cost 23,287     30,085
Loan Commitments, Allowance for Credit Loss 60      
Limited partnerships investment commitments $ 1,400      
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 $ 5,188     4,759
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  
Yen-denominated        
Schedule of Investments [Line Items]        
Available for sale, fixed maturity securities, allowance for credit losses 0      
Securities held to maturity, fixed maturities, amortized cost 23,287     30,085
Japan government and agencies | Yen-denominated        
Schedule of Investments [Line Items]        
Available for sale, fixed maturity securities, allowance for credit losses 0      
Securities held to maturity, fixed maturities, amortized cost 22,387     $ 22,241
Zero-credit-loss expectation | Japan government and agencies | Yen-denominated        
Schedule of Investments [Line Items]        
Securities held to maturity, fixed maturities, amortized cost $ 22,000      
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 20.00%      
TEXAS | Commercial Mortgage and Transitional Real Estate Loans        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 14.00%      
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans        
Schedule of Investments [Line Items]        
Concentration Risk, Percentage 10.00%