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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) investment | Sep. 30, 2022 USD ($) investment | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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) | $ 47 |  |  |  | $ 13 |  |  |  |  |  |  |
Transitional real estate loan commitments | 661 |  |  |  | 661 |  |  |  |  |  |  |
Middle market loan program unfunded amount | 19 |  |  |  | 19 |  |  |  |  | $ 28 |  |
Middle market loan commitments | 745 |  |  |  | 745 |  |  |  |  |  |  |
Amortized Cost | 16,904 |  |  |  | 16,904 |  |  |  |  | 19,063 |  |
Loan commitments, allowance for credit loss | 19 |  | $ 26 |  | 19 |  | $ 26 |  |  |  |  |
Limited partnerships investment commitments | $ 2,400 |  |  |  | $ 2,400 |  |  |  |  |  |  |
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 | $ 5,100 |  |  |  | $ 5,100 |  |  |  |  | 6,800 |  |
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding | 0 |  |  |  | 0 |  |  |  |  | 0 |  |
Credit allowance | 260 |  |  |  | 260 |  |  |  |  | 192 |  |
Nonaccrual loans, interest income | 0 |  |  |  | 0 |  |  |  |  |  |  |
Financing receivable, before allowance for credit loss | 13,133 |  |  |  | 13,133 |  |  |  |  | 13,688 |  |
Real estate owned, amount of loss at acquisition | (53) |  | 0 |  | (53) |  | 0 |  |  |  |  |
Real estate owned, held-for-sale | 16 |  |  |  | 16 |  |  |  |  |  |  |
Real estate owned, held-and-used | 73 |  |  |  | 73 |  |  |  |  |  |  |
Other investments | 5,241 |  |  |  | 5,241 |  |  |  |  | 4,070 |  |
Real estate owned |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other investments | 89 |  |  |  | 89 |  |  |  |  | 0 |  |
Transitional real estate loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonaccrual loans, no allowance | 65 |  |  |  | 65 |  |  |  |  |  |  |
Financing receivable, before allowance for credit loss | 6,550 |  |  |  | 6,550 |  |  |  |  |  |  |
Real estate owned, amount of loss at acquisition | (53) |  |  |  | (53) |  |  |  |  |  |  |
Amortized cost of foreclosure or deed in lieu foreclosure | 142 |  |  |  | 142 |  |  |  |  |  |  |
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit allowance | 35 |  |  |  | 35 |  |  |  |  |  |  |
Financing receivable, before allowance for credit loss | 481 |  |  |  | 481 |  |  |  |  |  |  |
Amortized cost of financing receivable in anticipation of foreclosure | 546 |  |  |  | 546 |  |  |  |  |  |  |
Middle market loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Nonaccrual loans, no allowance | 0 |  |  |  | 0 |  |  |  |  |  |  |
Financing receivable, before allowance for credit loss | 4,849 |  |  |  | 4,849 |  |  |  |  |  |  |
Transitional real estate loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit allowance | 111 | [1] | $ 55 | [1] | 111 | [1] | $ 55 | [1] | $ 76 | 54 | $ 53 | $ 68
Financing receivable, before allowance for credit loss | 6,550 |  |  |  | 6,550 |  |  |  |  | $ 6,509 |  |
Zero-credit-loss expectation | Japan government and agencies |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | $ 16,100 |  |  |  | $ 16,100 |  |  |  |  |  |  |
CALIFORNIA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 20.00% |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
[1] | Excludes allowance on firm loan commitments of $19 and $26 as of September 30, 2023 and 2022, respectively.

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