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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 6,119	$ 5,641
Allowance for uncollectible reinsurance	(55)	(48)
Reinsurance Recoverables, Including Reinsurance Premium Paid	6,011	5,527
Uncollectible reinsurance
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Allowance for uncollectible reinsurance	(108)	(114)
Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	259
Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	305
Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	259
AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5,296
AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1,598
AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	2,323
AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	638
AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	46
AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	669
AM Best, Below plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	22
Corporate
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	308
Allowance for uncollectible reinsurance	(2)	0
Reinsurance Recoverables, Including Reinsurance Premium Paid	306
Corporate | Uncollectible reinsurance
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Allowance for uncollectible reinsurance	(2)	0
Corporate | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	308
Corporate | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	305
Corporate | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Corporate | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	3
Corporate | AM Best, Below plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Property and Casualty Insurance Products | Operating Segments
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5,566
Allowance for uncollectible reinsurance	(52)	(48)
Reinsurance Recoverables, Including Reinsurance Premium Paid	5,461
Property and Casualty Insurance Products | Operating Segments | Uncollectible reinsurance
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Allowance for uncollectible reinsurance	(105)	(114)
Property and Casualty Insurance Products | Operating Segments | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	259
Property and Casualty Insurance Products | Operating Segments | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	305
Property and Casualty Insurance Products | Operating Segments | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	254
Property and Casualty Insurance Products | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	4,748
Property and Casualty Insurance Products | Operating Segments | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1,598
Property and Casualty Insurance Products | Operating Segments | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	1,788
Property and Casualty Insurance Products | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	638
Property and Casualty Insurance Products | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	37
Property and Casualty Insurance Products | Operating Segments | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	666
Property and Casualty Insurance Products | Operating Segments | AM Best, Below plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	21
Group Insurance Policy [Member] | Operating Segments
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	245
Allowance for uncollectible reinsurance	(1)	0
Reinsurance Recoverables, Including Reinsurance Premium Paid	244
Group Insurance Policy [Member] | Operating Segments | Uncollectible reinsurance
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Allowance for uncollectible reinsurance	(1)	$ 0
Group Insurance Policy [Member] | Operating Segments | Mandatory and Voluntary Risk Pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Group Insurance Policy [Member] | Operating Segments | Captives
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Group Insurance Policy [Member] | Operating Segments | Other not rated companies
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	5
Group Insurance Policy [Member] | Operating Segments | AMBestRated [Member]
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	240
Group Insurance Policy [Member] | Operating Segments | AM Best, A++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Group Insurance Policy [Member] | Operating Segments | AM Best, A+ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	230
Group Insurance Policy [Member] | Operating Segments | AM Best, A Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Group Insurance Policy [Member] | Operating Segments | AM Best, A- Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	9
Group Insurance Policy [Member] | Operating Segments | AM Best, B++ Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	0
Group Insurance Policy [Member] | Operating Segments | AM Best, Below plus plus Rating
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Reinsurance Recoverables, Gross	$ 1

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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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