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Consolidated Statements Of Operations (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non Variable Interest Entity [Member] | Financial Guarantee Insurance Segment [Member] |  |  |
Ceded premiums earned | $ 5 | $ 6 | $ 7

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