Premiums Receivable (Tables)

3 Months Ended

Mar. 31, 2023

Credit Loss [Abstract]

Premium Receivable, Allowance for Credit Loss [Table Text Block]

Premiums Receivable and Agents' Balances
	As of March 31, 2023		As of December 31, 2022
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")	$	5,013	$	4,698
Receivables for loss sensitive business, by credit quality:
AA	104		106
A	44		38
BBB	122		119
BB	59		56
Below BB	40		41
Total receivables for loss sensitive business	369		360
Total Premiums Receivable and Agents' Balances, Gross	5,382		5,058
ACL	(111)		(109)
Total Premiums Receivable and Agents' Balances, Net of ACL	$	5,271	$	4,949

Rollforward of ACL on Premiums Receivable and Agents' Balances for the Three Months Ended
	March 31, 2023						March 31, 2022
	Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive Business		Receivables for Loss Sensitive Business		Total		Premiums Receivable and Agents' Balances, Excluding Receivables for Loss Sensitive Business		Receivables for Loss Sensitive Business		Total
Beginning ACL	$	85	$	24	$	109	$	83	$	22	$	105
Current period provision (release)	12		1		13		13		—		13
Current period write-offs	(14)		—		(14)		(15)		—		(15)
Current period recoveries	3		—		3		3		—		3
Ending ACL	$	86	$	25	$	111	$	84	$	22	$	106