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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 7,207	$ 7,069
Allowance for uncollectible reinsurance	(103)	(105)	$ (99)
Reinsurance Recoverables, Including Reinsurance Premium Paid	7,104	6,964	6,524	$ 6,013
Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	208	218
Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	353	319
Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	230	284
AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6,416	6,248
AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,398	2,094
AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,522	2,667
AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	811	764
AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	658	85
AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5	618
AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	22	20
Corporate
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	244	261
Allowance for uncollectible reinsurance	(2)	(2)	(2)
Reinsurance Recoverables, Including Reinsurance Premium Paid	242	259
Corporate | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	244	261
Corporate | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	241	259
Corporate | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Corporate | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	3	2
Corporate | AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Property and Casualty Insurance Products | Operating Segments
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6,702	6,557
Allowance for uncollectible reinsurance	(100)	(102)	(96)		$ (105)
Reinsurance Recoverables, Including Reinsurance Premium Paid	6,602	6,455
Property and Casualty Insurance Products | Operating Segments | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	208	218
Property and Casualty Insurance Products | Operating Segments | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	353	319
Property and Casualty Insurance Products | Operating Segments | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	226	279
Property and Casualty Insurance Products | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5,915	5,741
Property and Casualty Insurance Products | Operating Segments | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,398	2,094
Property and Casualty Insurance Products | Operating Segments | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,030	2,169
Property and Casualty Insurance Products | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	810	763
Property and Casualty Insurance Products | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	653	79
Property and Casualty Insurance Products | Operating Segments | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2	616
Property and Casualty Insurance Products | Operating Segments | AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	22	20
Group Insurance Policy [Member] | Operating Segments
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	261	251
Allowance for uncollectible reinsurance	(1)	(1)	$ (1)
Reinsurance Recoverables, Including Reinsurance Premium Paid	260	250
Group Insurance Policy [Member] | Operating Segments | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Group Insurance Policy [Member] | Operating Segments | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Group Insurance Policy [Member] | Operating Segments | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	4	5
Group Insurance Policy [Member] | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	257	246
Group Insurance Policy [Member] | Operating Segments | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Group Insurance Policy [Member] | Operating Segments | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	251	239
Group Insurance Policy [Member] | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1	1
Group Insurance Policy [Member] | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5	6
Group Insurance Policy [Member] | Operating Segments | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0	0
Group Insurance Policy [Member] | Operating Segments | AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 0	$ 0

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount of allowance for credit loss on reinsurance recoverable.

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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