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INVESTMENTS - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
investment
Jan. 01, 2020
USD ($)
Schedule of Investments [Line Items]          
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, number of investments | investment     0 0  
Equity securities, FV-NI, unrealized gain (loss)   $ 210      
Transitional real estate loan commitments   601      
Commercial mortgage loan commitments   32      
Middle market loan program unfunded amount   25 $ 99    
Middle market loan commitments   $ 2,200      
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   $ 18      
Middle Market Loan Commitment with External Manager, Remaining Commitment Outstanding, Included in Total Middle Market Loan Commitment Total $ 2,000        
Securities held to maturity, fixed maturities, amortized cost   24,474 30,085    
Middle Market Loan Commitment Increase During Period $ 2,200        
Off-Balance Sheet, Credit Loss, Liability   35      
Securities Received as Collateral   6,654 4,759    
Financing Receivable, Troubled Debt Restructuring   0      
Debt Securities, Available-for-sale, Allowance for Credit Loss   38      
Limited partnerships investment commitments   1,600      
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]          
Securities held to maturity, fixed maturities, amortized cost   24,474 30,085    
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 0      
Commercial mortgage and transitional real estate loans | California          
Schedule of Investments [Line Items]          
Concentration Risk, Percentage   21.00%      
Commercial mortgage and transitional real estate loans | Texas          
Schedule of Investments [Line Items]          
Concentration Risk, Percentage   14.00%      
Commercial mortgage and transitional real estate loans | Florida          
Schedule of Investments [Line Items]          
Concentration Risk, Percentage   11.00%      
Japan government and agencies | Zero-credit-loss expectation          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost   $ 23,300      
Japan government and agencies | Yen-denominated          
Schedule of Investments [Line Items]          
Securities held to maturity, fixed maturities, amortized cost   23,448 $ 22,241    
Debt Securities, Available-for-sale, Allowance for Credit Loss   $ 0