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Claim and Claim Adjustment Expense Reserves - Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | $ 17 | $ 13 | $ 33 | $ 44
Medical professional liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development |  |  | (2) | 9
Other professional liability and management liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | 11 | 17 | 28 | 16
Surety |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | (20) | (21) | (46) | (28)
Warranty |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | 7 | (2) | 20 | (11)
Commercial auto |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | 25 |  | 46 | 11
General liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | 28 |  | 47 | 70
Workers’ compensation |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | (57) | (2) | (106) | (100)
Other property and casualty operations |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | 1 | 1 | (11) | 22
Other insurance operations |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Total pretax (favorable) unfavorable development | $ 22 | $ 20 | $ 57 | $ 55

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- Definition Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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