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INVESTMENTS - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
investment
Dec. 31, 2016
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 3 0
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) $ (124)    
Allowance for loan loss 27 11  
Transitional real estate loan commitments 605    
Commercial mortgage loan commitments 25    
Middle market loan program unfunded amount 56 $ 109  
Middle market loan commitments 521    
Limited partnerships investment commitments $ 916    
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 $ 19