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Schedule II (Condensed Balance Sheets) (Detail) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets [Abstract]        
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $120 and $131) $ 1,236 $ 1,557    
Total assets 2,168 2,606 $ 3,375  
Liabilities:        
Total liabilities 4,244 4,253    
Equity:        
Preferred stock, par value $1 per share; authorized shares—10,000,000; issued and outstanding—none 0 0    
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--283,186,115 and 283,186,115 283 283    
Additional paid-in capital 2,492 2,515    
Retained earnings (deficit) (1,591) (1,144)    
Accumulated other comprehensive income (loss), net of tax (128) (139) (283) $ 100
Treasury stock, at cost--232,215,934 and 232,323,184 shares (3,145) (3,172)    
Total shareholders' equity of MBIA Inc. (2,089) (1,657)    
Total liabilities and equity 2,168 $ 2,606    
Fixed-maturity securities held as available-for-sale, amortized cost $ 1,391      
Preferred stock, par value $ 1 $ 1    
Preferred stock, authorized shares 10,000,000 10,000,000    
Preferred stock, issued 0 0    
Preferred stock, outstanding 0 0    
Common stock, par value $ 1 $ 1    
Common stock, authorized shares 400,000,000 400,000,000    
Common stock, issued shares 283,186,115 283,186,115    
Treasury stock, shares 232,215,934 232,323,184    
Parent Company [Member]        
Assets [Abstract]        
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $120 and $131) $ 114 $ 127    
Short-term investments held as available-for-sale, at fair value (amortized cost $445 and $480) 445 480    
Total investments 559 607    
Cash and cash equivalents 32 33 $ 16 $ 15
Other assets 1 26    
Total assets 592 666    
Liabilities:        
Investment agreements 204 221    
Long-term debt 278 278    
Affiliate loans payable 478 533    
Accumulated loss of wholly-owned subsidiaries 1,721 1,290    
Other liabilities 0 1    
Total liabilities 2,681 2,323    
Equity:        
Preferred stock, par value $1 per share; authorized shares—10,000,000; issued and outstanding—none 0 0    
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--283,186,115 and 283,186,115 283 283    
Additional paid-in capital 2,492 2,515    
Retained earnings (deficit) (1,591) (1,144)    
Accumulated other comprehensive income (loss), net of tax (128) (139)    
Treasury stock, at cost--232,215,934 and 232,323,184 shares (3,145) (3,172)    
Total shareholders' equity of MBIA Inc. (2,089) (1,657)    
Total liabilities and equity 592 666    
Fixed-maturity securities held as available-for-sale, amortized cost 120 131    
Short-term investments, amortized cost $ 445 $ 480    
Preferred stock, par value $ 1 $ 1    
Preferred stock, authorized shares 10,000,000 10,000,000    
Preferred stock, issued 0 0    
Preferred stock, outstanding 0 0    
Common stock, par value $ 1 $ 1    
Common stock, authorized shares 400,000,000 400,000,000    
Common stock, issued shares 283,186,115 283,186,115    
Treasury stock, shares 232,215,934 232,323,184