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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, 2023 | Mar. 31, 2022
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Direct Premiums Written | $ 61 | $ 30
Assumed Reinsurance Premiums Written | 0 | 0
Ceded Reinsurance Premiums Written | 43 | 18
Premiums written, net of reinsurance | (18) | (12)
Direct Premiums Earned | 46 | 23
Assumed Reinsurance Premiums Earned | 0 | 0
Ceded Reinsurance Premiums Earned | $ 32 | $ 8

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