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Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Direct Premiums Written | $ 91 | $ 65 | $ 265 | $ 181
Assumed Reinsurance Premiums Written | 22 | 14 | 60 | 14
Ceded Reinsurance Premiums Written | 83 | 52 | 232 | 195
Premiums written, net of reinsurance | (31) | (27) | (92) | 0
Direct Premiums Earned | 89 | 59 | 243 | 157
Assumed Reinsurance Premiums Earned | 17 | 3 | 50 | 3
Ceded Reinsurance Premiums Earned | $ 73 | $ 45 | $ 194 | $ 113

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