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Commitments and Contingencies - Commitments and Contingencies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2017 | Dec. 31, 2021
Loss Contingencies [Line Items] |  |  |  |  |
Other Commitment | $ 3,800 |  |  |  |
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability | 70 | $ 77 |  |  |
Premium tax offsets | 0 | 0 |  |  |
Fair value of derivative instrument in a net liability position | 33 |  |  |  |
Collateral already posted | 31 |  |  |  |
Additional Collateral, Aggregate Fair Value | 0 |  |  |  |
Other liabilities | Retained Earnings |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Off-Balance Sheet, Credit Loss, Liability | $ 7 | 9 | $ 22 |  | $ 25
Insurance-related Assessments [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund | 1.00% |  |  |  |
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund | 2.00% |  |  |  |
Limited partnerships and other alternative investments |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Other Commitment | $ 2,100 |  |  |  |
Private Placement Securities |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Other Commitment | 1,000 |  |  |  |
Mortgage loans |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Other Commitment | 636 |  |  |  |
Cancelable mortgage loan [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Other Commitment | 53 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred Revenue | 64 | 209 |  |  |
Adverse development from comprehensive annual review | 300 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 300 |  |  |  |
Reinsurance Policy, Type [Axis]: Retroactive Reinsurance [Member] | Other liabilities |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred Revenue | 914 | 997 |  |  |
Asbestos and Environmental |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 224 |  |  |  |
Asbestos and Environmental | Segment Reconciling Items |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Liability for unpaid losses and loss adjustment expenses, at undiscounted amounts | 315 |  |  |  |
Prior accident year development [1] | 141 | $ 0 | $ 0 |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred Revenue | 850 |  |  |  |
Reinsurance, Amount Retained, Per Policy |  |  |  | $ 1,700 |
Adverse development from comprehensive annual review | 1,500 |  |  |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Remaining [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 0 |  |  |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | $ 1,500 |  |  |  |

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + 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 for accident years not separately presented in claim development information. 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 4B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-4B + Details
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