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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 20, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2024    
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, 2024    
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     $ 247.3
Entity Common Stock, Shares Outstanding   50,971,033  
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 2025 are incorporated by reference into Part III of this Form 10-K.

   
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location New York    
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

 

We have audited the accompanying consolidated balance sheets of MBIA Inc. and its subsidiaries (the “Company”) as of December 31, 2024 and 2023 and the related consolidated statements of operations, of comprehensive income (loss), of changes in shareholders' equity and of cash flows for each of the three years in the period ended December 31, 2024, including the related notes and financial statement schedules listed in the index appearing under Item 15(a)(2) (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013 )issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

 

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.