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INVESTMENTS - Investment Exposures Individually Exceeded 10% of Shareholders' Equity (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Investments [Abstract] |  |  |
Credit Rating | [1] | A+ | A+
Amortized Cost | [1] | $ 34,849 | $ 33,822
Fair Value | [1] | $ 31,596 | $ 32,844
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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