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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net realized capital gains (losses) | $ 19 | $ (276) | $ (455)
Income tax expense (benefit) | (120) | 363 | 9
Other underwriting expenses | (938) | (846) | (682)
Net income (loss) | 1,373 | 2,517 | $ 597
URA(D) of securities | Reclassification from Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net realized capital gains (losses) | (18) | 285 |
Income tax expense (benefit) | 6 | (41) |
Net income (loss) | (12) | 244 |
Benefit plan net gain (loss) | Reclassification from Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income tax expense (benefit) | 0 | 0 |
Other underwriting expenses | (2) | 2 |
Net income (loss) | $ (1) | $ 2 |

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