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INVESTMENTS - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
investment
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
investment
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 3
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, amortized cost     $ 773
Reclassified investments from the held-to-maturity portfolio to the available-for-sale portfolio, aggregate unrealized gain (loss)     $ 47
Equity securities, FV-NI, unrealized gain (loss) $ 64    
Transitional real estate loan commitments 875    
Commercial mortgage loan commitments 27    
Middle market loan program unfunded amount 99 $ 56  
Middle market loan commitments 502    
Specific loan loss reserves $ 6 $ 0  
Number of loan loss reserves related to specific middle market loans 2    
Limited partnerships investment commitments $ 1,300    
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    
Commercial mortgage and transitional real estate loans | California      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 20.00%    
Commercial mortgage and transitional real estate loans | Texas      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 15.00%    
Commercial mortgage and transitional real estate loans | Florida      
Schedule of Investments [Line Items]      
Concentration Risk, Percentage 10.00%