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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |
Direct Premiums Written | $ (2) | $ 11
Assumed Reinsurance Premiums Written | 0 | 0
Ceded Reinsurance Premiums Written | 7 | (1)
Premiums written, net of reinsurance | 9 | (12)
Direct Premiums Earned | 17 | 13
Assumed Reinsurance Premiums Earned | 0 | 1
Ceded Reinsurance Premiums Earned | 3 | 3
Reinsurance on premiums earned, Net | $ 14 | $ 10

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