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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 7,071	$ 6,622		$ 5,641
Allowance for uncollectible reinsurance	(105)	(99)	$ (108)	(114)
Reinsurance Recoverables, Including Reinsurance Premium Paid	6,966	6,523		5,527
Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	218	239
Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	319	331
Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	284	260
AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6,250	5,792
AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,094	1,860
AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,669	2,511
AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	764	713
AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	85	46
AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	618	642
AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	20	20
Corporate
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	263	278
Allowance for uncollectible reinsurance	(2)	(2)	(2)	0
Reinsurance Recoverables, Including Reinsurance Premium Paid	261	276
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	263	278
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	261	275
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	2	3
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	6,557	6,093
Allowance for uncollectible reinsurance	(102)	(96)	(105)	(114)
Reinsurance Recoverables, Including Reinsurance Premium Paid	6,455	5,997
Property and Casualty Insurance Products | Operating Segments | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	218	239
Property and Casualty Insurance Products | Operating Segments | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	319	331
Property and Casualty Insurance Products | Operating Segments | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	279	255
Property and Casualty Insurance Products | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5,741	5,268
Property and Casualty Insurance Products | Operating Segments | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,094	1,860
Property and Casualty Insurance Products | Operating Segments | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,169	1,999
Property and Casualty Insurance Products | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	763	713
Property and Casualty Insurance Products | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	79	37
Property and Casualty Insurance Products | Operating Segments | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	616	639
Property and Casualty Insurance Products | Operating Segments | AM Best, Below B plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	20	20
Group Insurance Policy [Member] | Operating Segments
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	251	251
Allowance for uncollectible reinsurance	(1)	(1)	$ (1)	$ 0
Reinsurance Recoverables, Including Reinsurance Premium Paid	250	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	5	5
Group Insurance Policy [Member] | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	246	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	239	237
Group Insurance Policy [Member] | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1	0
Group Insurance Policy [Member] | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	6	9
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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