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Premiums Receivable - Premiums Receivable and Agents' Balances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	$ 6,115	$ 5,716
Premium Receivable, Allowance for Credit Loss	(117)	(109)	$ (109)	$ (105)
Premiums Receivable, Net	5,998	5,607
Premiums Receivable, Due in One Year or Less, Excluding Receivables for Loss within a Deductible and Retrospectively-Rated Policy Premiums [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	5,624	5,303
Premium Receivable, Allowance for Credit Loss	(97)	(89)	(85)	(83)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	491	413
Premium Receivable, Allowance for Credit Loss	(20)	(20)	$ (24)	$ (22)
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, AA Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	97	94
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, A Rating [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	57	54
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BBB Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	193	136
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, BB Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	94	84
Premiums Receivable, Loss Within a Deductible and Retrospectively-Rated Policy Premiums [Member] | Standard & Poor's, Below BB Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Premiums Receivable, Gross	$ 50	$ 45

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.

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Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.

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