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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) investment | Sep. 30, 2021 USD ($) investment | Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Held to maturity securities transferred to available for sale securities, number of investments | investment |  | 0 | 0 |
Equity securities, FV-NI, unrealized gain (loss) | $ (21) | $ (313) |  |
Transitional real estate loan commitments | 982 | 982 |  |
Middle market loan program unfunded amount | 14 | 14 |  | $ 11
Middle market loan commitments | 442 | 442 |  |
Held to maturity, fixed maturity securities, amortized cost | 17,472 | 17,472 |  | 22,008
Loan Commitments, Allowance for Credit Loss | 26 | 26 |  |
Limited partnerships investment commitments | $ 2,100 | $ 2,100 |  |
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% |  |
Securities Lending, Securities Received as Collateral | $ 7,000 | $ 7,000 |  | 6,800
Financing Receivable, Troubled Debt Restructuring | 0 | 0 | $ 0 |
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding | 0 | 0 |  | $ 0
Zero-credit-loss expectation | Japan government and agencies |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Held to maturity, fixed maturity securities, amortized cost | $ 16,600 | $ 16,600 |  |
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 19.00% |  |
TEXAS | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 13.00% |  |
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 10.00% |  |

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