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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Investments [Abstract] |  |  |
Credit Rating | [1] | A+ | A+
Amortized Cost | [1] | $ 39,151 | $ 42,618
Fair Value | [1] | $ 40,222 | $ 44,178
Investment, Type [Extensible Enumeration] |  | Japan National Government [Member] | Japan National Government [Member]
[1] | Japan Government Bonds (JGBs) or JGB-backed securities

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