Reinsurance (Tables)

6 Months Ended

Jun. 30, 2023

Reinsurance Disclosures [Abstract]

Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]

Reinsurance Recoverables by Credit Quality Indicator
	As of June 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++	$	2,173	$	—	$	—	$	2,173	$	2,094	$	—	$	—	$	2,094
A+	2,049		238		247		2,534		2,169		239		259		2,667
A	893		—		—		893		763		1		—		764
A-	70		6		—		76		79		6		—		85
B++	601		—		3		604		616		—		2		618
Below B++	20		—		—		20		20		—		—		20
Total Rated by A.M. Best	5,806		244		250		6,300		5,741		246		261		6,248
Mandatory (Assigned) and Voluntary Risk Pools	207		—		—		207		218		—		—		218
Captives	304		—		—		304		319		—		—		319
Other not rated companies	205		6		—		211		279		5		—		284
Gross Reinsurance Recoverables	6,522		250		250		7,022		6,557		251		261		7,069
Allowance for uncollectible reinsurance	(107)		(1)		(2)		(110)		(102)		(1)		(2)		(105)
Net Reinsurance Recoverables	$	6,415	$	249	$	248	$	6,912	$	6,455	$	250	$	259	$	6,964

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

Allowance for Uncollectible Reinsurance for the Three and Six Months Ended
	Three Months Ended June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
P&C beginning allowance for uncollectible reinsurance	$	102	$	96	$	102	$	96
Beginning allowance for disputed amounts	58		56		60		54
P&C beginning ACL	44		40		42		42
Current period provision (release)	1		1		3		(1)
P&C ending ACL	45		41		45		41
Ending allowance for disputed amounts	62		61		62		61
P&C ending allowance for uncollectible reinsurance	$	107	$	102	$	107	$	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	$	110	$	105	$	110	$	105