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INVESTMENTS - Equity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 762 | $ 1,088
Yen-denominated |  |
Equity Securities, FV-NI [Line Items] |  |
Equity securities | 522 | 751
Dollar-denominated |  |
Equity Securities, FV-NI [Line Items] |  |
Equity securities | 240 | 252
Other currencies |  |
Equity Securities, FV-NI [Line Items] |  |
Equity securities | $ 0 | $ 85

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