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Reinsurance and Indemnification - Schedule of Effects of Reinsurance Ceded and Indemnification Programs on Property and Casualty Premiums Earned and Accident and Health Insurance Premiums and Contract Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Property and casualty insurance premiums earned |  |  |  |
Reinsurance |  |  |  |
Property and casualty insurance premiums earned | $ (640) | $ (552) | $ (1,791) | $ (1,697)
Accident and health insurance premiums and contract charges |  |  |  |
Reinsurance |  |  |  |
Accident and health insurance premiums and contract charges | $ (122) | $ (16) | $ (145) | $ (37)

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- Definition Represents the amount of premiums and contract charges related to life insurance, accident and health insurance and annuity contracts that are assumed and earned by another insurer as a result of reinsurance arrangements. + References No definition available. + Details
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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 No definition available. + Details
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