XML 117 R106.htm IDEA: XBRL DOCUMENT v3.25.0.1
Common and Preferred Stock - (Narrative) (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
May 03, 2023
Class of Stock [Line Items]      
Treasury stock shares acquired 0 3,600,000  
Preferred stock shares issued 0 0  
Shares repurchased under share repurchase program, average price per share   $ 8.12  
Preferred stock shares outstanding 0 0  
Dividends declared on preferred stock $ 0 $ 0  
Preferred stock par or stated value per share $ 1 1  
Shares repurchased under share repurchase program remaining authorized amount $ 71   $ 100
Dividend declared per common share   $ 8  
MBIA Insurance Corporation [Member]      
Class of Stock [Line Items]      
Preferred stock par or stated value per share $ 1,000    
Preferred stock liquidation preference $ 100,000    
Preferred Stock [Member] | MBIA Insurance Corporation [Member]      
Class of Stock [Line Items]      
Preferred stock shares issued 2,759    
Preferred stock, carrying value issued and outstanding $ 28    
Shares repurchased under share repurchase program, average price per share $ 10,900    
Face value of repurchased preferred stock 10.90%    
Dividend rate on preferred stock determined rate SOFR plus 2.26161%    
Preferred stock dividend rate 2.26161%    
Unaffiliated Investors [Member] | MBIA Insurance Corporation [Member]      
Class of Stock [Line Items]      
Preferred stock shares outstanding 1,315    
Held by MBIA Inc. [Member] | MBIA Insurance Corporation [Member]      
Class of Stock [Line Items]      
Preferred stock shares outstanding 1,444