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INVESTMENTS - Debt Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cost |  |
Available-for-sale securities | $ 1,136 |
Estimated Fair Value |  |
Available-for-sale securities | 1,134 |
Debt Securities | 1,175 | $ 983
Debt Securities |  |
Cost |  |
Trading securities | 43 | 43
Available-for-sale securities | 1,136 | 979
Total debt securities | 1,179 | 1,022
Gains |  |
Trading securities | 0 | 0
Available-for-sale securities | 26 | 26
Total debt securities | 26 | 26
Losses |  |
Trading securities | (2) | (4)
Available-for-sale securities | (28) | (61)
Total debt securities | (30) | (65)
Estimated Fair Value |  |
Trading securities | 41 | 39
Available-for-sale securities | 1,134 | 944
Debt Securities | $ 1,175 | $ 983

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