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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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- Definition Amount of allowance for credit loss on reinsurance recoverable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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