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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 21, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000814585    
Current Fiscal Year End Date --12-31    
Document Annual Report true    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Document Transition Report false    
Document Period End Date Dec. 31, 2023    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Trading Symbol MBI    
Entity Registrant Name MBIA INC.    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 387,593,303
Entity Common Stock, Shares Outstanding   50,925,911  
Title of 12(b) Security Common Stock    
Security Exchange Name NYSE    
Entity File Number 001-09583    
Entity Tax Identification Number 06-1185706    
Entity Address, Address Line One 1 Manhattanville Road, Suite 301    
Entity Address, City or Town Purchase    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10577    
Entity Incorporation, State or Country Code CT    
City Area Code 914    
Local Phone Number 273-4545    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference [Text Block]

Documents incorporated by reference:

Portions of the Registrant’s Definitive Proxy Statement for its Annual Shareholders Meeting to be held in May of 2024 are incorporated by reference into Part III of this Form 10-K.

   
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location New York