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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
	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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- References

No definition available.

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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

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