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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other net realized capital gains (losses) | $ (17) | $ 5 | $ (24) | $ 10
Income tax expense (benefit) | 108 | 80 | 207 | 122
Other underwriting expenses | (234) | (205) | (458) | (405)
Net income (loss) | 724 | 670 | 1,457 | 1,035
URA(D) on securities | Reclassification From Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other net realized capital gains (losses) | 11 | 4 | 17 | 10
Income tax expense (benefit) | (2) | (2) | (3) | (4)
Net income (loss) | 9 | 2 | 14 | 5
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) | (6) | 0 | (7) | 0
Other underwriting expenses | (31) | (1) | 31 | 1
Net income (loss) | $ 24 | $ 1 | $ 25 | $ 1

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