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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves - Net Prior Year Loss Reserve Development in Property and Casualty Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | $ (17) | $ (10) | $ (2) | $ 4
Medical professional liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | 8 | 8 | 17 | 16
Other professional liability and management liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | 9 |  | 22 | 10
Surety |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | (20) | (15) | (48) | (53)
Commercial auto |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development |  |  | 21 | 30
General liability |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development |  |  | 41 |
Workers’ compensation |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | (2) | 2 | (86) | (40)
Property and other |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development | (12) | (5) | $ (33) | $ 1
Other insurance operations |  |  |  |
Net Prior Year Development [Abstract] |  |  |  |
Pretax favorable development |  |  |  |

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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 https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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