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Subsequent Events (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2024 USD ($) participant | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($)
Subsequent Event [Line Items] |  |  |  |  |
Pre-tax pension settlement charge |  |  |  | $ 47 |
Pension settlement charge, after tax and noncontrolling interests |  |  |  | $ 37 |
Hurricane |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Loss from catastrophes |  |  | $ 55 |  | $ 55
Forecast | Hurricane | Minimum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Loss from catastrophes |  | $ 25 |  |  |
Forecast | Hurricane | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Loss from catastrophes |  | 55 |  |  |
Subsequent Event | CNA Employee Retirement Plan |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Amount transferred to the Insurer of the defined benefit obligation | $ 1,045 |  |  |  |
Number of plan participants and beneficiaries | participant | 7,600 |  |  |  |
Defined benefit plan, plan participants and beneficiaries, percentage | 60.00% |  |  |  |
Subsequent Event | Forecast |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Pre-tax pension settlement charge |  | 370 |  |  |
Pension settlement charge, after tax and noncontrolling interests |  | $ 265 |  |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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