XML 53 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
INVESTMENTS - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
investment
Jun. 30, 2017
USD ($)
investment
Mar. 31, 2017
investment
Sep. 30, 2018
USD ($)
investment
Dec. 31, 2017
USD ($)
Schedule of Investments [Line Items]            
Held to maturity securities transferred to available for sale securities, number of investments | investment   0 3 0 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) $ 25       $ 1  
Allowance for loan loss 25       25 $ 11
Transitional real estate loan commitments 720       720  
Commercial mortgage loan commitments 86       86  
Middle market loan program unfunded amount 155       155 $ 109
Middle market loan commitments 896       896  
Limited partnerships investment commitments $ 1,000       $ 1,000  
Percentage that the lending policy requires that the fair value of the securities received as collateral be of the fair value of the loaned securities 102.00%       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%       100.00%