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v3.21.2

Claim and Claim Adjustment Expense Reserves, Net Prior Year Development in Property and Casualty Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | $ 29 | $ 22 | $ 14 | $ 7
Property and Casualty Operations [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 11 | 28 | 26 | 43
Medical Professional Liability [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development |  |  | 8 | 10
Other Professional Liability and Management Liability [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 10 | (9) | 10 | (6)
Surety [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | (23) |  | (38) | (30)
Commercial Auto [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 30 | 15 | 30 | 24
Workers' Compensation [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | (42) | (61) | (42) | (74)
Property and Other [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 14 | 27 | 6 | 33
Other Insurance Operations [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | $ 40 | $ 50 | $ 40 | $ 50

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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