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Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Direct Premiums Written | $ 81 | $ 61
Assumed Reinsurance Premiums Written | 17 | 0
Ceded Reinsurance Premiums Written | 70 | 43
Premiums written, net of reinsurance | (28) | (18)
Direct Premiums Earned | 75 | 46
Assumed Reinsurance Premiums Earned | 16 | 0
Ceded Reinsurance Premiums Earned | $ 57 | $ 32

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