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Common And Preferred Stock (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2007 | Aug. 12, 2011 Directors | Dec. 31, 2012 M | Dec. 31, 2011 | Dec. 31, 2012 MBIA Insurance Corporation [Member] | Dec. 31, 2012 Preferred Stock [Member] | Dec. 31, 2012 Preferred Stock [Member] MBIA Insurance Corporation [Member] | Dec. 31, 2012 2007 Repurchase Authorization [Member] | Dec. 31, 2012 Warrants [Member] | Dec. 31, 2012 B Warrants [Member] | Dec. 31, 2012 B2 Warrants [Member] | Dec. 31, 2012 Long-Term Incentive Plan [Member] | Dec. 31, 2011 Long-Term Incentive Plan [Member] | Dec. 31, 2012 Unaffiliated Investors [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of common stock |  |  |  |  |  |  |  |  | 11,500,000 | 9,800,000 | 4,000,000 |  |  |
Exercise price of common stock |  |  |  |  |  |  |  |  | 30.25 | 30.25 | 16.20 |  |  |
Fair value of warrants |  |  | $ 6,000,000 | $ 38,000,000 |  |  |  |  |  |  |  |  |  |
Authorized repurchase of common stock, value | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchased under share repurchase program, shares |  |  | 56,700,000 |  |  | 1,444 |  |  |  |  |  |  |  |
Repurchased under share repurchase program, cost |  |  | 2,275,000,000 | 2,276,000,000 |  |  |  | 977,000,000 |  |  |  |  |  |
Repurchased under share repurchase program, average price per share |  |  | $ 17.24 |  |  |  |  |  |  |  |  |  |  |
Remaining amount available under repurchase program |  |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Shares purchased for settling awards under long-term incentive plans |  |  |  |  |  |  |  |  |  |  |  | 8,784 | 102,578 |
Preferred stock issued, shares |  |  | 0 | 0 | 2,759 |  |  |  |  |  |  |  |  |
Preferred stock outstanding, shares |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  | 1,315
Preferred stock, carrying value issued and outstanding |  |  |  |  | $ 28,000,000 |  |  |  |  |  |  |  |  | $ 12,000,000
Repurchased under share repurchase program, average price per share |  |  |  |  |  |  | 10,900 |  |  |  |  |  |  |
Face value of preferred stock |  |  |  |  | 10.90% |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  | $ 1 | $ 1 |  | $ 1,000 |  |  |  |  |  |  |  |
Preferred stock liquidation preference |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Dividend rate on preferred stock determined rate |  |  |  |  |  | LIBOR plus 200 basis points |  |  |  |  |  |  |  |
Period of non payment of dividends on preferred stock, months |  |  | 18 |  |  |  |  |  |  |  |  |  |  |
Number of new directors elected |  | 2 |  |  |  |  |  |  |  |  |  |  |  |

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