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Common and Preferred Stock - (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 07, 2023 | Aug. 31, 2022 | Dec. 31, 2023 | May 03, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |
Treasury stock shares acquired |  |  | 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
Preferred stock par or stated value per share |  |  | $ 1 |  | $ 1
Shares repurchased under share repurchase program remaining authorized amount |  |  | $ 71 | $ 100 |
Excise tax percenatge |  | 1.00% |  |  |
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 |  |
Preferred stock repurchased during period shares |  |  | 1,444 |  |
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 [Member] | MBIA Insurance Corporation [Member] | Secured Overnight Financing Rate ("SOFR") [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock dividend rate |  |  | 2.26161% |  |
Unaffiliated Investors [Member] | MBIA Insurance Corporation [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock shares outstanding |  |  | 1,315 |  |

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