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Consolidated Statements Of Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Statements of Comprehensive Income (Loss)        
Net income (loss) attributable to MBIA Inc. $ (8) $ (56) $ (126) $ (396)
Available-for-sale securities with no credit losses:        
Unrealized gains (losses) arising during the period 11 44 29 18
Reclassification adjustments for (gains) losses included in net income (loss) 0 0 7 2
Foreign currency translation:        
Reclassification adjustments for (gains) losses included in net income (loss) 0 0 5 0
Instrument-specific credit risk of liabilities measured at fair value:        
Unrealized gains (losses) arising during the period (4) 5 (2) 3
Reclassification adjustments for (gains) losses included in net income (loss) 0 0 0 28
Total other comprehensive income (loss) 7 49 39 51
Comprehensive income (loss) $ (1) $ (7) $ (87) $ (345)