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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Credit Rating | [1] | A+ | A+ |
Investment, Type [Extensible Enumeration] |  | Japan National Government [Member] | Japan National Government [Member] | [1]
Amortized Cost | [1] | $ 36,641 | $ 39,151 |
Fair Value | [1] | $ 37,170 | $ 40,222 |
[1] | Japan Government Bonds (JGBs) or JGB-backed securities

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