Premiums Receivable (Tables)

3 Months Ended

Mar. 31, 2024

Credit Loss [Abstract]

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

Premiums Receivable and Agents' Balances
	As of March 31, 2024		As of December 31, 2023
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")	$	5,676	$	5,303
Receivables for loss sensitive business, by credit quality:
AA	93		94
A	57		54
BBB	140		136
BB	88		84
Below BB	45		45
Total receivables for loss sensitive business	423		413
Total Premiums Receivable and Agents' Balances, Gross	6,099		5,716
ACL	(111)		(109)
Total Premiums Receivable and Agents' Balances, Net of ACL	$	5,988	$	5,607

Rollforward of ACL on Premiums Receivable and Agents' Balances for the Three Months Ended
	March 31, 2024						March 31, 2023
	Receivables Excluding Receivables for Loss Sensitive Business		Receivables for Loss Sensitive Business		Total		Receivables Excluding Receivables for Loss Sensitive Business		Receivables for Loss Sensitive Business		Total
Beginning ACL	$	89	$	20	$	109	$	85	$	24	$	109
Current period provision	15		—		15		12		1		13
Current period write-offs	(15)		—		(15)		(14)		—		(14)
Current period recoveries	2		—		2		3		—		3
Ending ACL	$	91	$	20	$	111	$	86	$	25	$	111