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Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Direct Premiums Written | $ 37 | $ (3) | $ 67 | $ (5)
Assumed Reinsurance Premiums Written | 0 | 0 | 0 | 0
Ceded Reinsurance Premiums Written | 27 | 9 | 46 | 16
Premiums written, net of reinsurance | (9) | 13 | (21) | 21
Direct Premiums Earned | 30 | 14 | 53 | 31
Assumed Reinsurance Premiums Earned | 0 | 0 | 0 | 0
Ceded Reinsurance Premiums Earned | $ 16 | $ 3 | 24 | 6
Reinsurance on premiums earned, Net |  |  | $ 28 | $ 25

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