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Reinsurance - Credit Quality Information (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | $ 7,161 |  | $ 7,207 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (102) |  | (103) | $ (110) |  |
Net Reinsurance Recoverables | 7,059 |  | 7,104 |  |  |
Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 212 |  | 208 |  |  |
Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 367 |  | 353 |  |  |
Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 225 |  | 230 |  |  |
AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 6,357 |  | 6,416 |  |  |
AM Best, A++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,319 |  | 2,398 |  |  |
AM Best, A+ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,559 |  | 2,522 |  |  |
AM Best, A Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 817 |  | 811 |  |  |
AM Best, A- Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 635 |  | 658 |  |  |
AM Best, B++ Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 5 |  | 5 |  |  |
AM Best, Below B plus plus Rating [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 22 |  | 22 |  |  |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 6,651 |  | 6,702 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (99) | $ (98) | (100) | (107) | $ (102) | $ (102)
Net Reinsurance Recoverables | 6,552 |  | 6,602 |  |  |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 212 |  | 208 |  |  |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 367 |  | 353 |  |  |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 219 |  | 226 |  |  |
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Before Disputed Amounts [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (45) | (44) | (43) | (45) | (44) | (42)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | Reinsurance Contract [Axis]: Disputes [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (54) | $ (54) | (57) | (62) | $ (58) | $ (60)
Operating Segments [Member] | Property, Liability and Casualty Insurance Product Line | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 5,853 |  | 5,915 |  |  |
Operating Segments [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 274 |  | 261 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (1) |  | (1) | (1) |  |
Net Reinsurance Recoverables | 273 |  | 260 |  |  |
Operating Segments [Member] | Group Benefits | Mandatory and Voluntary Risk Pools [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Operating Segments [Member] | Group Benefits | Captives [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Operating Segments [Member] | Group Benefits | Other not rated companies [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 6 |  | 4 |  |  |
Operating Segments [Member] | Group Benefits | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 268 |  | 257 |  |  |
Operating Segments [Member] | AM Best, A++ Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,319 |  | 2,398 |  |  |
Operating Segments [Member] | AM Best, A++ Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Operating Segments [Member] | AM Best, A+ Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 2,062 |  | 2,030 |  |  |
Operating Segments [Member] | AM Best, A+ Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 263 |  | 251 |  |  |
Operating Segments [Member] | AM Best, A Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 816 |  | 810 |  |  |
Operating Segments [Member] | AM Best, A Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 1 |  | 1 |  |  |
Operating Segments [Member] | AM Best, A- Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 631 |  | 653 |  |  |
Operating Segments [Member] | AM Best, A- Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 4 |  | 5 |  |  |
Operating Segments [Member] | AM Best, B++ Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 3 |  | 2 |  |  |
Operating Segments [Member] | AM Best, B++ Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 22 |  | 22 |  |  |
Operating Segments [Member] | AM Best, Below B plus plus Rating [Member] | Group Benefits |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 0 |  | 0 |  |  |
Corporate |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 236 |  | 244 |  |  |
Reinsurance Recoverable, Allowance for Credit Loss | (2) |  | (2) | $ (2) |  |
Net Reinsurance Recoverables | 234 |  | 242 |  |  |
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 | AMBestRated [Member] |  |  |  |  |  |
Reinsurance Recoverable, Credit Quality Indicator [Line Items] |  |  |  |  |  |
Reinsurance Recoverables, Gross | 236 |  | 244 |  |  |
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 | 234 |  | 241 |  |  |
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 |  |  |

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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/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477409/944-310-45-5 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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