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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings (deficit) [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Treasury Stock [Member]
Total Shareholders' Equity Of MBIA Inc. [Member]
Preferred Stock [Member]
Total equity balance at Dec. 31, 2019     $ 2,999 $ 607 $ (2) $ (3,061) $ 826  
Balance (in common stock shares) at Dec. 31, 2019   283,433,401            
Balance (in treasury stock shares) at Dec. 31, 2019           (204,000,108)    
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member]       (42)        
Net income (loss) $ (333)     (333)        
Other comprehensive income (loss) 93       93      
Treasury shares acquired under share repurchase program           $ (65)    
Treasury shares acquired under share repurchase program (in shares)           (8,082,756)    
Common shares issued (cancelled), net (in shares)   0            
Other           $ 43    
Others (in shares)           809,869    
Period change     (38)       (342)  
Total equity balance at Mar. 31, 2020 497 $ 283 2,961 232 91 $ (3,083) 484 $ 13
Balance (in common stock shares) at Mar. 31, 2020   283,433,401            
Balance (in treasury stock shares) at Mar. 31, 2020           (211,272,995)    
Balance (in preferred stock shares) at Mar. 31, 2020               1,315
Total equity balance at Dec. 31, 2020 $ 149   2,962 (13) 115 $ (3,211) 136  
Balance (in common stock shares) at Dec. 31, 2020 283,186,115 283,186,115            
Balance (in treasury stock shares) at Dec. 31, 2020 (229,508,967)         (229,508,967)    
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member]       0        
Net income (loss) $ (106)     (106)        
Other comprehensive income (loss) (76)       (76)      
Treasury shares acquired under share repurchase program           $ 0    
Treasury shares acquired under share repurchase program (in shares)           0    
Common shares issued (cancelled), net (in shares)   0            
Other           $ 33    
Others (in shares)           671,502    
Period change     (28)       (177)  
Total equity balance at Mar. 31, 2021 $ (28) $ 283 $ 2,934 $ (119) $ 39 $ (3,178) $ (41) $ 13
Balance (in common stock shares) at Mar. 31, 2021 283,186,115 283,186,115            
Balance (in treasury stock shares) at Mar. 31, 2021 (228,837,465)         (228,837,465)    
Balance (in preferred stock shares) at Mar. 31, 2021 0             1,315