Reinsurance (Tables)

9 Months Ended

Sep. 30, 2022

Reinsurance Disclosures [Abstract]

Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]

Reinsurance Recoverables by Credit Quality Indicator
	As of September 30, 2022								As of December 31, 2021
	Property and Casualty		Group Benefits		Corporate		Total		Property and Casualty		Group Benefits		Corporate		Total
A.M. Best Financial Strength Rating
A++	$	1,867	$	—	$	—	$	1,867	$	1,860	$	—	$	—	$	1,860
A+	2,102		244		267		2,613		1,999		237		275		2,511
A	742		1		—		743		713		—		—		713
A-	43		8		—		51		37		9		—		46
B++	621		—		2		623		639		—		3		642
Below B++	20		—		—		20		20		—		—		20
Total Rated by A.M. Best	5,395		253		269		5,917		5,268		246		278		5,792
Mandatory (Assigned) and Voluntary Risk Pools	227		—		—		227		239		—		—		239
Captives	347		—		—		347		331		—		—		331
Other not rated companies	251		7		—		258		255		5		—		260
Gross Reinsurance Recoverables	6,220		260		269		6,749		6,093		251		278		6,622
Allowance for uncollectible reinsurance	(102)		(1)		(2)		(105)		(96)		(1)		(2)		(99)
Net Reinsurance Recoverables	$	6,118	$	259	$	267	$	6,644	$	5,997	$	250	$	276	$	6,523

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

Allowance for Uncollectible Reinsurance for the Three Months Ended
	September 30, 2022								September 30, 2021
	Property and Casualty		Group Benefits		Corporate		Total		Property and Casualty		Group Benefits		Corporate		Total
Beginning allowance for uncollectible reinsurance	$	102	$	1	$	2	$	105	$	96	$	1	$	2	$	99
Beginning allowance for disputed amounts	61		—		—		61		56		—		—		56
Beginning ACL	41		1		2		44		40		1		2		43
Current period provision (release)	1		—		—		1		1		—		—		1
Ending ACL	42		1		2		45		41		1		2		44
Ending allowance for disputed amounts	60		—		—		60		55		—		—		55
Ending allowance for uncollectible reinsurance	$	102	$	1	$	2	$	105	$	96	$	1	$	2	$	99

Allowance for Uncollectible Reinsurance for the Nine Months Ended
	September 30, 2022								September 30, 2021
	Property and Casualty		Group Benefits		Corporate		Total		Property and Casualty		Group Benefits		Corporate		Total
Beginning allowance for uncollectible reinsurance	$	96	$	1	$	2	$	99	$	105	$	1	$	2	$	108
Beginning allowance for disputed amounts	54		—		—		54		53		—		—		53
Beginning ACL	42		1		2		45		52		1		2		55
Current period provision (release)	—		—		—		—		(11)		—		—		(11)
Ending ACL	42		1		2		45		41		1		2		44
Ending allowance for disputed amounts	60		—		—		60		55		—		—		55
Ending allowance for uncollectible reinsurance	$	102	$	1	$	2	$	105	$	96	$	1	$	2	$	99