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INVESTMENTS - Debt Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Cost |  |
Trading securities | $ 45 | $ 43
Available-for-sale securities | 1,728 | 1,136
Total debt securities | 1,773 | 1,179
Gains |  |
Trading securities | 1 | 0
Available-for-sale securities | 21 | 26
Total debt securities | 22 | 26
Losses |  |
Trading securities | (1) | (2)
Available-for-sale securities | (118) | (28)
Total debt securities | (119) | (30)
Estimated Fair Value |  |
Trading securities | 45 | 41
Available-for-sale securities | 1,631 | 1,134
Debt Securities | $ 1,676 | $ 1,175

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