Reinsurance (Reinsurance Recoverable on Ceded Reinsurance) (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
Jun. 30, 2025 |
Dec. 31, 2024 |
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| Reinsurance Disclosures [Abstract] | ||||||
| Reinsurance recoverable on unpaid losses and loss expenses | [1] | $ 18,453 | $ 18,346 | $ 17,691 | $ 17,734 | |
| Reinsurance recoverable on paid losses and loss expenses | [1] | 1,831 | 1,992 | |||
| Reinsurance recoverable on losses and loss expenses | [1] | 20,284 | 20,338 | |||
| Reinsurance Recoverables on Unpaid Losses, Allowance | 273 | 248 | ||||
| Reinsurance Recoverables on Paid Losses, Allowance | 51 | 72 | ||||
| Reinsurance Recoverable, Allowance for Credit Loss, Total | 324 | 320 | $ 323 | $ 310 | ||
| Reinsurance recoverable on policy benefits | [1] | 333 | 286 | |||
| Reinsurance Recoverables on Future Policy Benefits, Allowance | $ 0 | $ 0 | ||||
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- Definition Reinsurance Recoverables on Future Policy Benefits, Allowance No definition available.
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- Definition Amount, after allowance for credit loss, recoverable under reinsurance of liability for future policy benefit. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of allowance for credit loss on reinsurance recoverable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to and paid by the ceding insurer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of valuation allowance for reinsurance recoverables on paid losses. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of valuation allowance for reinsurance recoverables for losses reported to the ceding insurer but not yet paid, and for amounts expected based upon statistical projections and other measures of incurred losses and loss settlement expenses which have not yet been reported to the ceding insurer. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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