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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net gains (losses) on financial instruments at fair value and foreign exchange $ (42) $ 4 $ 45
Net income (loss) attributable to MBIA Inc. (447) (491) (195)
Amounts reclassified from AOCI [Member]      
Net income (loss) attributable to MBIA Inc. (31) (112) (8)
Unrealized gains (losses) on AFS, net [Member] | Amounts reclassified from AOCI [Member]      
Net realized investment gains (losses) (3) (67) 10
Instrument-specific credit risk of liabilities measured at fair value, net [Member] | Amounts reclassified from AOCI [Member]      
Other net realized gains (losses) (9) (20) 0
Net gains (losses) on financial instruments at fair value and foreign exchange $ (19) $ (25) $ (18)