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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) issuer investment | Sep. 30, 2015 USD ($) investment | Dec. 31, 2015 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |
Amortized Cost |  | $ 74,148 |  | $ 74,148 |  | $ 62,963
Held to maturity securities transferred to available for sale securities, number of investments | investment |  |  |  | 0 | 0 |
Middle Market Loan Receivable |  | 240 |  | $ 240 |  | 118
Middle Market Loan Program Unfunded Amount |  | 23 |  | 23 |  | 53
Middle market loan commitment |  | $ 409 |  | $ 409 |  |
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% |  |
Commercial mortgage loan commitments |  | $ 185 |  | $ 185 |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | [1] | 22 | $ 137 | 69 | $ 143 |
Parent Company and Other Business Segments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities available for sale, fixed maturities, amortized cost |  | 601 |  | 601 |  |
Securities available for sale, fixed maturities, fair value |  | 629 |  | 629 |  |
Variable Interest Entity, Consolidated |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Available-for-sale securities, equity securities |  | 1,014 |  | 1,014 |  | 363
Securities available for sale, fixed maturities, amortized cost |  | 4,870 |  | 4,870 |  | 3,739
Securities available for sale, fixed maturities, fair value |  | 5,494 |  | 5,494 |  | 4,554
Available-for-sale equity securities, amortized cost basis |  | 1,036 |  | 1,036 |  | 363
Variable Interest Entity, Not Consolidated |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities available for sale, fixed maturities, amortized cost |  | 5,241 |  | 5,241 |  | 4,731
Securities available for sale, fixed maturities, fair value |  | 5,814 |  | $ 5,814 |  | 5,093
Number of issuers of VIEs not-consolidated | issuer |  |  |  | 146 |  |
Bank loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Securities available for sale, fixed maturities, amortized cost |  | 2,100 |  | $ 2,100 |  | 1,400
Securities available for sale, fixed maturities, fair value |  | 1,900 |  | 1,900 |  | $ 1,400
Commercial mortgage loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Other investments held in unit trust, net of reserves, amortized cost |  | 481 |  | 481 |  |
Other investments, net of reserves, amortized cost |  | 555 |  | 555 |  |
Middle market loans |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Other investments held in unit trust, net of reserves, amortized cost |  | $ 8 |  | $ 8 |  |
[1] | Includes $22 and $6 for the three-month periods and $69 and $12 for the nine-month periods ended September 30, 2016 and 2015, respectively, from change in intent to sell securities or change in intent to hold securities until recovery; and $131 for the three- and nine-month periods ended September 30, 2015, for credit-related impairments

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