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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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- 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://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

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