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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic and diluted earnings per share:      
Net Income (Loss) Available to Common Stockholders, Basic, Total $ (441) $ (484) $ (149)
Income (loss) from discontinued operations, net of income taxes (3) (3) (54)
Less: Net income (loss) from discontinued operations attributable to noncontrolling interests 3 4 (8)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent, Total (6) (7) (46)
Net Income (Loss) $ (447) $ (491) $ (195)
Basic weighted average shares [1] 47,436,079 48,207,574 49,803,739
Diluted weighted average shares [1] 47,436,079 48,207,574 49,803,739
Continuing operations - Basic $ (9.31) $ (10.03) $ (3)
Continuing operations - Diluted (9.31) (10.03) (3)
Discontinued operations - Basic (0.12) (0.15) (0.92)
Discontinued operations - Diluted (0.12) (0.15) (0.92)
Net income (loss) per share attributable to MBIA Inc. - basic (9.43) (10.18) (3.92)
Earnings Per Share, Diluted $ (9.43) $ (10.18) $ (3.92)
Potentially dilutive securities excluded from the calculation of diluted EPS because of antidilutive affect 3,200,000 4,300,000 5,000,000
[1] Includes approximately 1 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the years ended December 31, 2024, 2023 and 2022 respectively.