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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statements of Comprehensive Income (Loss)      
Net income (loss) attributable to MBIA Inc. $ (447) $ (491) $ (195)
Available-for-sale securities with no credit losses:      
Unrealized gains (losses) arising during the period (19) 33 (362)
Reclassification adjustments for (gains) losses included in net income (loss) 3 67 (10)
Foreign currency translation:      
Foreign currency translation gains (losses) (1) 0 2
Instrument-specific credit risk of liabilities measured at fair value:      
Unrealized gains (losses) arising during the period 0 (1) (31)
Reclassification adjustments for (gains) losses included in net income (loss) 28 45 18
Total other comprehensive income (loss) 11 144 (383)
Comprehensive income (loss) attributable to MBIA Inc. $ (436) $ (347) $ (578)