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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |
Direct Premiums Written | $ (1) | $ (21) | $ 10 | $ (17)
Assumed Reinsurance Premiums Written | 0 | 0 | 0 | 0
Ceded Reinsurance Premiums Written | 0 | 0 | (1) | (1)
Premiums written, net of reinsurance | 0 | 20 | (11) | 16
Direct Premiums Earned | 14 | 10 | 27 | 40
Assumed Reinsurance Premiums Earned | 0 | 0 | 1 | 0
Ceded Reinsurance Premiums Earned | 3 | 2 | 6 | 4
Reinsurance on premiums earned, Net | $ 11 | $ 8 | $ 21 | $ 36

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