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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic and diluted earnings per share:        
Net income (loss) from continuing operations available to common shareholders $ (7) $ (51) $ (125) $ (391)
Income (loss) from discontinued operations, net of income taxes (1) (1) (1) (2)
Less: Net income (loss) from discontinued operations attributable to noncontrolling interests 0 4 0 3
Net income (loss) from discontinued operations attributable to MBIA Inc. (1) (5) (1) (5)
Net income (loss) attributable to MBIA Inc. $ (8) $ (56) $ (126) $ (396)
Basic weighted average shares [1] 49,597,200 47,671,114 49,169,475 47,332,337
Diluted weighted average shares [1] 49,597,200 47,671,114 49,169,475 47,332,337
Continuing operations - Basic $ (0.15) $ (1.08) $ (2.54) $ (8.26)
Continuing operations - Diluted (0.15) (1.08) (2.54) (8.26)
Discontinued operations - Basic (0.02) (0.1) (0.03) (0.11)
Discontinued operations - Diluted (0.02) (0.1) (0.03) (0.11)
Net income (loss) per share - basic (0.17) (1.18) (2.57) (8.37)
Net income (loss) per share - diluted $ (0.17) $ (1.18) $ (2.57) $ (8.37)
Potentially dilutive securities excluded from the calculation of diluted EPS because of antidilutive affect 900,000 3,400,000 900,000 3,400,000
[1] Includes approximately 1 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the three and nine months ended September 30, 2025 and 2024.