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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net gains (losses) on financial instruments at fair value and foreign exchange $ (12) $ (5) $ (29) $ (56)
Net income (loss) attributable to MBIA Inc. (8) (56) (126) (396)
Amounts reclassified from AOCI [Member]        
Net income (loss) attributable to MBIA Inc. (0) 0 (12) (30)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]        
Net realized investment gains (losses) (0) 0 (7) (2)
Foreign currency translation [Member] | Amounts reclassified from AOCI [Member]        
Net gains (losses) on financial instruments at fair value and foreign exchange 0 0 (5) 0
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Amounts reclassified from AOCI [Member]        
Other net realized gains (losses) (0) 0 0 (9)
Net gains (losses) on financial instruments at fair value and foreign exchange $ 0 $ 0 $ 0 $ (19)