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Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Direct Premiums Written | $ 93 | $ 55 | $ 174 | $ 115
Assumed Reinsurance Premiums Written | 20 | 0 | 38 | 0
Ceded Reinsurance Premiums Written | 79 | 100 | 150 | 142
Premiums written, net of reinsurance | (34) | 45 | (62) | 27
Direct Premiums Earned | 79 | 52 | 154 | 98
Assumed Reinsurance Premiums Earned | 17 | 0 | 33 | 0
Ceded Reinsurance Premiums Earned | $ 64 | $ 37 | $ 121 | $ 69

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