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INVESTMENTS - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) investment | Dec. 31, 2022 USD ($) investment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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) | $ 63 | $ (340) | $ 141 |
Transitional real estate loan commitments | 488 |  |  |
Middle market loan program unfunded amount | 24 | 28 |  |
Middle market loan commitments | 820 |  |  |
Nonaccrual loans, interest income | 0 |  |  |
Securities held to maturity, fixed maturities, amortized cost | 17,824 | 19,063 |  |
Financing receivable, allowance for credit loss | 274 | 192 |  |
Financing receivable, before allowance for credit loss | 12,801 | 13,688 |  |
Real estate owned, held-for-sale | 17 |  |  |
Real estate owned, held-and-used | 210 |  |  |
Other investments | 4,530 | 4,070 |  |
Limited partnerships investment commitments | $ 2,300 |  |  |
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% |  |  |
Securities received as collateral | $ 4,300 | 6,800 |  |
Repurchase agreements and repurchase to maturity transactions outstanding | 0 | 0 |  |
Fair value of debt securities on deposit with regulatory authorities in the United States and Japan | 20 |  |  |
Available for sale, fixed maturity securities, amortized cost | 70,689 | 75,469 |  |
Available-for-sale, allowance for credit losses | 0 | 0 |  |
Real estate owned |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Other investments | 227 | 0 |  |
Transitional real estate loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Nonaccrual loans, no allowance | 160 |  |  |
Amortized cost of foreclosure or deed in lieu foreclosure | 284 |  |  |
Real estate owned, amount of loss at acquisition | (66) |  |  |
Financing receivable, before allowance for credit loss | 6,114 |  |  |
Transitional real estate loans | Potential Foreclosure or Deed-in-lieu Foreclosure |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Amortized cost of financing receivable in anticipation of foreclosure | 502 |  |  |
Financing receivable, allowance for credit loss | 55 |  |  |
Financing receivable, before allowance for credit loss | 600 |  |  |
Middle market loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Nonaccrual loans, no allowance | 0 |  |  |
Financing receivable, before allowance for credit loss | $ 4,677 |  |  |
California | Commercial mortgage and transitional real estate loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage | 21.00% |  |  |
Texas | Commercial mortgage and transitional real estate loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage | 12.00% |  |  |
Florida | Commercial mortgage and transitional real estate loans | Mortgages |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Concentration Risk, Percentage | 11.00% |  |  |
Commercial mortgage loans |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing receivable, allowance for credit loss | $ 16 | 9 | $ 10 | $ 32
Financing receivable, before allowance for credit loss | 1,709 | $ 1,784 |  |
Japan government and agencies | Zero-credit-loss expectation |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Securities held to maturity, fixed maturities, amortized cost | $ 16,900 |  |  |

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