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Liability For Unpaid Claims And Claim Adjustment Expenses - Claims and Claim Adjustment Expenses (Details) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) casualty_line | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | May 25, 2022 USD ($) | May 24, 2022 USD ($) | Dec. 31, 2021 USD ($)
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | $ 1,264 |  |  |  |  |
Other short-duration lines not included in claims development table | 288 | $ 302 | $ 305 | $ 281 | $ 281 | $ 288
Total reinsurance recoverables | 288 |  |  |  |  |
Insurance lines other than short-duration | 241 |  |  |  |  |
Unallocated claim adjustment expenses | 74 |  |  |  |  |
Policy and contract claims | $ 1,867 | $ 1,870 | $ 1,786 | $ 1,496 | $ 1,496 | $ 1,455
Major property and casualty lines | casualty_line | 4 |  |  |  |  |
Liability |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | $ 1,041 |  |  |  |  |
Other short-duration lines not included in claims development table | 187 |  |  |  |  |
Professional |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 2 |  |  |  |  |
Other short-duration lines not included in claims development table | 0 |  |  |  |  |
Property |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 198 |  |  |  |  |
Other short-duration lines not included in claims development table | 12 |  |  |  |  |
Specialty |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 4 |  |  |  |  |
Other short-duration lines not included in claims development table | 70 |  |  |  |  |
Other short-duration lines not included in claims development table |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |
Total liabilities for unpaid claims and claim adjustment expenses, net of reinsurance | 19 |  |  |  |  |
Other short-duration lines not included in claims development table | $ 19 |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4D Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-7 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (cc) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 4: 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)(13)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 9E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480046/944-40-55-9E Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
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