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INVESTMENTS - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) investment | Dec. 31, 2018 USD ($) investment | Dec. 31, 2017 USD ($) 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 | 0 | 3
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) | $ 64 |  |
Transitional real estate loan commitments | 875 |  |
Commercial mortgage loan commitments | 27 |  |
Middle market loan program unfunded amount | 99 | $ 56 |
Middle market loan commitments | 502 |  |
Specific loan loss reserves | $ 6 | $ 0 |
Number of loan loss reserves related to specific middle market loans | 2 |  |
Limited partnerships investment commitments | $ 1,300 |  |
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 | $ 18 |  |
Commercial mortgage and transitional real estate loans | California |  |  |
Schedule of Investments [Line Items] |  |  |
Concentration Risk, Percentage | 20.00% |  |
Commercial mortgage and transitional real estate loans | Texas |  |  |
Schedule of Investments [Line Items] |  |  |
Concentration Risk, Percentage | 15.00% |  |
Commercial mortgage and transitional real estate loans | Florida |  |  |
Schedule of Investments [Line Items] |  |  |
Concentration Risk, Percentage | 10.00% |  |

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