Reinsurance (Tables)

9 Months Ended

Sep. 30, 2020

Credit Loss [Abstract]

Reinsurance Recoverable, Credit Quality Indicator [Table Text Block]

Reinsurance Recoverables by Credit Quality Indicator as of September 30, 2020
	Property and Casualty		Group Benefits		Corporate		Total
A.M. Best Financial Strength Rating
A++	$	1,301	$	—	$	—	$	1,301
A+	1,754		234		309		2,297
A	571		—		—		571
A-	31		9		—		40
B++	673		—		3		676
Below B++	23		1		—		24
Total Rated by A.M. Best	4,353		244		312		4,909
Mandatory (Assigned) and Voluntary Risk Pools	263		—		—		263
Captives	319		—		—		319
Other not rated companies	279		7		—		286
Gross Reinsurance Recoverables	5,214		251		312		5,777
Allowance for uncollectible reinsurance	(106)		(1)		(2)		(109)
Net Reinsurance Recoverables	$	5,108	$	250	$	310	$	5,668

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

Allowance for Uncollectible Reinsurance
	Three Months Ended September 30, 2020								Nine Months Ended September 30, 2020
	Property and Casualty		Group Benefits		Corporate		Total		Property and Casualty		Group Benefits		Corporate		Total
Beginning allowance for uncollectible reinsurance	$	108	$	1	$	2	$	111	$	114	$	—	$	—	$	114
Beginning allowance for disputed amounts	57		—		—		57		66		—		—		66
Beginning ACL	51		1		2		54		48		—		—		48
Cumulative effect of accounting change [1]	—		—		—		—		—		1		1		2
Adjusted beginning ACL	51		1		2		54		48		1		1		50
Current period provision (release)	1		—		—		1		3		—		1		4
Current period gross recoveries	—		—		—		—		1		—		—		1
Ending ACL	52		1		2		55		52		1		2		55
Ending allowance for disputed amounts	54		—		—		54		54		—		—		54
Ending allowance for uncollectible reinsurance	$	106	$	1	$	2	$	109	$	106	$	1	$	2	$	109

[1] Represents the adjustment to the ACL recorded on adoption of accounting guidance for credit losses on January 1, 2020. For further information refer to Note 1 - Basis of Presentation and Significant Accounting Policies