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Claim and Claim Adjustment Expense Reserves - A&EP Reserves (Details) - A&EP Reserves - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2010 | Dec. 31, 2023
A&EP Reserves [Abstract] |  |  |  |  |  |
Net A&EP claim and allocated claim adjustment expense reserves |  |  |  |  | $ 1,600 |
Aggregate limit under A&EP loss portfolio transfer |  |  |  |  | 4,000 |
Ceded A&EP claim and allocated claim adjustment expense reserves under existing third party reinsurance contracts transferred to NICO under A&EP loss portfolio transfer |  |  |  |  | 1,200 |
Reinsurance premium paid to NICO under A&EP loss portfolio transfer |  |  |  |  | 2,000 |
Net reinsurance receivables transferred to NICO under A&EP loss portfolio transfer |  |  |  |  | 215 |
Total consideration |  |  |  |  | $ 2,200 |
Retroactive reinsurance benefit recognized | $ 11 | $ 15 | $ 36 | $ 38 |  |
Cumulative amounts ceded under loss portfolio transfer | 3,600 |  | 3,600 |  |  | $ 3,600
Unrecognized deferred retroactive reinsurance benefit | 382 |  | 382 |  |  | $ 417
Fair value of collateral trust account | $ 2,300 |  | $ 2,300 |  |  |

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- Definition Net book value of billed third party reinsurance receivables transferred to National Indemnity Company ("NICO") under asbestos and environmental claim (A&EP) loss portfolio transfer. + References No definition available. + Details
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- Definition Fair value portion of a collateral trust account established by National Indemnity (NICO) as security for its obligations to CNA Financial Corporation (CNA). + References No definition available. + Details
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- Definition Total consideration transferred to National Indemnity Company ("NICO") under asbestos and environmental claim (A&EP) loss portfolio transfer, including reinsurance premium paid and net book value of billed third party reinsurance receivables transferred. + References No definition available. + Details
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- Definition Cumulative amounts ceded to National Indemnity Company ("NICO") under asbestos and environmental claim (A&EP) loss portfolio transfer. + References No definition available. + Details
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- Definition Amount of asbestos and environmental ceded claim and allocated claim adjustment expense reserves under existing third party reinsurance contracts. + References No definition available. + Details
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- Definition Aggregate limit of net asbestos and environmental claim and allocated claim adjustment expense reserves ceded to National Indemnity Company ("NICO") under a retroactive reinsurance agreement. + References No definition available. + Details
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- Definition Amount of reinsurance premium paid to National Indemnity Company ("NICO") under asbestos and environmental claim (A&EP) loss portfolio transfer. + References No definition available. + Details
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- Definition Amount of retroactive benefit recognized under retroactive reinsurance accounting. + References No definition available. + Details
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- Definition Amount of unrecognized benefit related to loss portfolio transfer to National Indemnity Company ("NICO") under retroactive reinsurance accounting. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, net of estimated reinsurance recoveries. + References Reference 1: 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 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 + Details
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- Details
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