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Claim and Claim Adjustment Expense Reserves, Net Prior Year Development in Property and Casualty Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | $ (10) | $ (15) | $ 4 | $ (8)
Property and Casualty Operations [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | (10) | (15) | (36) | (58)
Medical Professional Liability [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 8 | 25 | 16 | 35
Other Professional Liability and Management Liability [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development |  |  | 10 | (6)
Surety [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | (15) | (40) | (53) | (70)
Commercial Auto [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development |  | 9 | 30 | 33
General Liability [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development |  | 15 |  | 15
Workers' Compensation [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | 2 | (23) | (40) | (97)
Property and Other [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development | $ (5) | $ (1) | 1 | 32
Other Insurance Operations [Member] |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax (favorable) unfavorable development |  |  | $ 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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