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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) investment | Jun. 30, 2017 USD ($) investment | Mar. 31, 2017 investment | Sep. 30, 2016 investment | Dec. 31, 2016 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |
Held to maturity securities transferred to available for sale securities, number of investments | investment | 0 | 3 | 0 | 0 |
Middle Market Loan Program Unfunded Amount | $ 133 |  |  |  | $ 91
Middle market loan commitments | $ 530 |  |  |  |
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% |  |  |  |
Allowance for loan losses for commercial mortgage loans and middle market loans | $ 8 |  |  |  | $ 3
Commercial mortgage loan commitments | 103 |  |  |  |
Held-to-maturity Securities, Transferred Security, at Carrying Value |  | $ 773 |  |  |
Held-to-maturity Securities, Transferred Security, Unrealized Gain (Loss) |  | $ 47 |  |  |
Limited partnerships investment commitments | 365 |  |  |  |
Parent Company and Other Business Segments |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Securities available for sale, fixed maturities, amortized cost | 681 |  |  |  |
Securities available for sale, fixed maturities, fair value | $ 700 |  |  |  |

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- Definition Percentage that the lending policy requires that the fair value of the securities and/or cash received as collateral be of the fair value of the loaned securities in securities lending transactions. + References No definition available. + Details
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