Reinsurance (Tables)

9 Months Ended

Sep. 30, 2023

Reinsurance Disclosures [Abstract]

Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]

Reinsurance Recoverables by Credit Quality Indicator
	As of September 30, 2023								As of December 31, 2022
	P&C		Group Benefits		Corporate		Total		P&C		Group Benefits		Corporate		Total
A.M. Best Financial Strength Rating
A++	$	2,196	$	—	$	—	$	2,196	$	2,094	$	—	$	—	$	2,094
A+	2,112		238		247		2,597		2,169		239		259		2,667
A	844		—		—		844		763		1		—		764
A-	69		6		—		75		79		6		—		85
B++	596		—		2		598		616		—		2		618
Below B++	—		—		—		—		20		—		—		20
Total Rated by A.M. Best	5,817		244		249		6,310		5,741		246		261		6,248
Mandatory (Assigned) and Voluntary Risk Pools	207		—		—		207		218		—		—		218
Captives	307		—		—		307		319		—		—		319
Other not rated companies	242		6		—		248		279		5		—		284
Gross Reinsurance Recoverables	6,573		250		249		7,072		6,557		251		261		7,069
Allowance for uncollectible reinsurance	(106)		(1)		(2)		(109)		(102)		(1)		(2)		(105)
Net Reinsurance Recoverables	$	6,467	$	249	$	247	$	6,963	$	6,455	$	250	$	259	$	6,964

Reinsurance Recoverable, Allowance for Credit Loss [Table Text Block]

Allowance for Uncollectible Reinsurance for the Three and Nine Months Ended
	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
P&C beginning allowance for uncollectible reinsurance	$	107	$	102	$	102	$	96
Beginning allowance for disputed amounts	62		61		60		54
P&C beginning ACL	45		41		42		42
Current period provision (release)	1		1		4		—
P&C ending ACL	46		42		46		42
Ending allowance for disputed amounts	60		60		60		60
P&C ending allowance for uncollectible reinsurance	106		102		106		102
Group Benefits allowance for uncollectible reinsurance	1		1		1		1
Corporate allowance for uncollectible reinsurance	2		2		2		2
Total allowance for uncollectible reinsurance	$	109	$	105	$	109	$	105