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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Equity Securities, FV-NI [Line Items] |  |
Total equity securities | $ 764 | $ 796
Yen-denominated |  |
Equity Securities, FV-NI [Line Items] |  |
Total equity securities | 491 | 484
Dollar-denominated |  |
Equity Securities, FV-NI [Line Items] |  |
Total equity securities | $ 273 | $ 312

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