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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 |  |

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