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Premiums Receivable (Tables)

12 Months Ended

Dec. 31, 2023

Credit Loss [Abstract]

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


Premiums Receivable and Agents' Balances
			As of December 31,
			2023			2022
Premiums receivable, excluding receivables for losses within a deductible and retrospectively-rated policy premiums ("loss sensitive business")			$	5,303		$	4,698
Receivables for loss sensitive business, by credit quality:

AA			94			106
A			54			38
BBB			136			119
BB			84			56
Below BB			45			41
Total receivables for loss sensitive business			413			360

Total Premiums Receivable and Agents' Balances, Gross			5,716			5,058
ACL			(109)			(109)
Total Premiums Receivable and Agents' Balances, Net of ACL			$	5,607		$	4,949


Rollforward of ACL on Premiums Receivable and Agents' Balances for the Year Ended
			December 31, 2023												December 31, 2022												December 31, 2021
			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						Receivables Excluding Receivables for Loss Sensitive Business			Receivables for Loss Sensitive Business			Total
Beginning ACL			$	85		$	24		$	109					$	83		$	22		$	105					$	117		$	35		$	152
Current period provision (release)			52			(2)			50						48			3			51						17			(13)			4
Current period gross write-offs			(55)			(2)			(57)						(56)			(1)			(57)						(59)			—			(59)
Current period gross recoveries			7			—			7						10			—			10						8			—			8
Ending ACL			$	89		$	20		$	109					$	85		$	24		$	109					$	83		$	22		$	105