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INVESTMENTS - Additional Information (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) investment | Mar. 31, 2023 USD ($) investment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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) | $ 71 | $ (5) |  |
Transitional real estate loan commitments | 442 |  |  |
Middle market loan program unfunded amount | 24 |  | $ 24 |
Middle market loan commitments | 787 |  |  |
Other loans commitments | 5 |  |  |
Amortized Cost | 16,694 |  | 17,824 |
Limited partnerships investment commitments | $ 2,200 |  |  |
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% |  |  |
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% |  |  |
Securities Lending, Securities Received as Collateral | $ 4,500 |  | 4,300 |
Repurchase Agreements and Repurchase-to-Maturity Transactions Outstanding | 0 |  | 0 |
Nonaccrual loans, interest income | 0 | 0 |  |
Credit allowance | 232 |  | 274 |
Financing receivable, before allowance for credit loss | 12,592 |  | 12,801 |
Real estate owned, held-and-used |  |  | 210 |
Real estate owned, held-for-sale |  |  | 17 |
Depreciation expense | 1 |  |  |
Accumulated depreciation | 2 |  |  |
Other investments | 6,677 |  | 4,530 |
Real estate owned |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other investments | 253 |  | 227 |
Transitional real estate loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Nonaccrual loans, no allowance | $ 383 |  |  |
Percent of total financing receivables | 3.00% |  |  |
Weighted-average interest rate before modification | 8.30% |  |  |
Weighted-average interest rate after modification | 6.90% |  |  |
Amortized cost of foreclosure or deed in lieu foreclosure | $ 31 |  |  |
Gains (loss) due to foreclosure | 4 |  |  |
Amortized cost of financing receivable modified | 210 |  |  |
Credit allowance | 114 | 65 | 112 | $ 54
Financing receivable, before allowance for credit loss | 6,078 |  | 6,114 |
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost of financing receivable in loan modification | 601 |  |  |
Credit allowance | 60 |  |  |
Financing receivable, before allowance for credit loss | 598 |  |  |
Middle market loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Nonaccrual loans, no allowance | 0 |  | 0 |
Credit allowance | 99 | $ 149 | 146 | $ 129
Financing receivable, before allowance for credit loss | 4,586 |  | $ 4,677 |
Zero-credit-loss expectation | Japan government and agencies |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized Cost | $ 15,900 |  |  |
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 | 15.00% |  |  |
FLORIDA | Commercial Mortgage and Transitional Real Estate Loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage | 12.00% |  |  |

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