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INVESTMENTS - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
investment
Dec. 31, 2019
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 0    
Equity securities, FV-NI, unrealized gain (loss)   $ 141,000,000      
Transitional real estate loan commitments   665,000,000      
Commercial mortgage loan commitments   0      
Middle market loan program unfunded amount   11,000,000   $ 25,000,000  
Middle market loan commitments   $ 1,400,000,000      
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%      
Fair value of debt securities on deposit with regulatory authorities in the United States and Japan   $ 17,000,000      
Securities held to maturity, fixed maturities, amortized cost   22,008,000,000   24,474,000,000  
Available for sale, fixed maturity securities, amortized cost   85,369,000,000   91,630,000,000  
Middle market loan commitment increase during period $ 2,200,000,000        
Off-balance sheet, credit loss, liability   31,000,000   35,000,000  
Securities received as collateral   6,800,000,000   6,700,000,000  
Financing receivable, troubled debt restructuring   0      
Available-for-sale, allowance for credit losses   0   38,000,000  
Limited partnerships investment commitments   1,800,000,000      
Repurchase agreements and repurchase to maturity transactions outstanding   $ 0   0  
Accounting Standards Update 2019-04          
Schedule of Investments [Line Items]          
New accounting pronouncement or change in accounting principle effect of adoption unrealized gain loss net of tax reclassification to accumulated other comprehensive income         $ 848,000,000
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2019-04          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost     $ (6,900,000,000)    
Available for sale, fixed maturity securities, amortized cost     $ 6,900,000,000    
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   8.00%      
Yen-denominated          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost   $ 22,008,000,000   24,474,000,000  
Available for sale, fixed maturity securities, amortized cost   51,160,000,000   56,049,000,000  
Available-for-sale, allowance for credit losses   0   0  
Japan government and agencies | Zero-credit-loss expectation          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost   20,900,000,000      
Japan government and agencies | Yen-denominated          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost   21,089,000,000   23,448,000,000  
Available for sale, fixed maturity securities, amortized cost   30,335,000,000   32,959,000,000  
Available-for-sale, allowance for credit losses   $ 0   $ 0