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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | $ 6,749 |  | $ 6,622 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (105) | $ (105) | (99) | $ (99) | $ (99) | $ (108)
Net Reinsurance Recoverables | 6,644 |  | 6,523 |  |  |
Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 227 |  | 239 |  |  |
Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 347 |  | 331 |  |  |
Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 258 |  | 260 |  |  |
Reinsurance Contract [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 300 |  |  |  |  |
Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (45) | (44) | (45) | (44) | (43) | (55)
Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (60) | (61) | (54) | (55) | (56) | (53)
AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 5,917 |  | 5,792 |  |  |
AM Best, A++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 1,867 |  | 1,860 |  |  |
AM Best, A+ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,613 |  | 2,511 |  |  |
AM Best, A Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 743 |  | 713 |  |  |
AM Best, A- Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 51 |  | 46 |  |  |
AM Best, B++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 623 |  | 642 |  |  |
AM Best, Below B plus plus Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 20 |  | 20 |  |  |
Corporate |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 269 |  | 278 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (2) | (2) | (2) | (2) | (2) | (2)
Net Reinsurance Recoverables | 267 |  | 276 |  |  |
Corporate | Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (2) | (2) | (2) | (2) | (2) | (2)
Corporate | Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 0 | 0 | 0 | 0 | 0 | 0
Corporate | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 269 |  | 278 |  |  |
Corporate | AM Best, A++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | AM Best, A+ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 267 |  | 275 |  |  |
Corporate | AM Best, A Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | AM Best, A- Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate | AM Best, B++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2 |  | 3 |  |  |
Corporate | AM Best, Below B plus plus Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 6,220 |  | 6,093 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (102) | (102) | (96) | (96) | (96) | (105)
Net Reinsurance Recoverables | 6,118 |  | 5,997 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 227 |  | 239 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 347 |  | 331 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 251 |  | 255 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (42) | (41) | (42) | (41) | (40) | (52)
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (60) | (61) | (54) | (55) | (56) | (53)
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 5,395 |  | 5,268 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 1,867 |  | 1,860 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A+ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,102 |  | 1,999 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 742 |  | 713 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, A- Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 43 |  | 37 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, B++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 621 |  | 639 |  |  |
Property, Liability and Casualty Insurance Product Line | Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 20 |  | 20 |  |  |
Group Benefits | Operating Segments [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 260 |  | 251 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (1) | (1) | (1) | (1) | (1) | (1)
Net Reinsurance Recoverables | 259 |  | 250 |  |  |
Group Benefits | Operating Segments [Member] | Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Group Benefits | Operating Segments [Member] | Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Group Benefits | Operating Segments [Member] | Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 7 |  | 5 |  |  |
Group Benefits | Operating Segments [Member] | Reinsurance Contract [Axis]: Before Uncollectible Reinsurance [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (1) | (1) | (1) | (1) | (1) | (1)
Group Benefits | Operating Segments [Member] | Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Group Benefits | Operating Segments [Member] | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 253 |  | 246 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, A++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, A+ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 244 |  | 237 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, A Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 1 |  | 0 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, A- Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 8 |  | 9 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, B++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Group Benefits | Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | $ 0 |  | $ 0 |  |  |

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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 https://asc.fasb.org/extlink&oid=126734703&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 https://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 https://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
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