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INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
investment
Mar. 31, 2018
investment
Jun. 30, 2017
USD ($)
investment
Mar. 31, 2017
investment
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]            
Held to maturity securities transferred to available for sale securities, number of investments | investment 0 0 3 0    
Debt Securities, Held-to-maturity, Transfer, Amount     $ 773      
Debt Securities, Held-to-maturity, Transfer, Unrealized Gain (Loss)     $ 47      
Equity securities, FV-NI, unrealized gain (loss) $ 19       $ (24)  
Allowance for loan loss 21       21 $ 11
Transitional real estate loan commitments 1,200       1,200  
Commercial mortgage loan commitments 79       79  
Middle market loan program unfunded amount 90       90 $ 109
Middle market loan commitments 774       774  
Limited partnerships investment commitments $ 1,100       $ 1,100  
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%       102.00%