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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Millions, except Share data | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Total Shareholders' Equity Of MBIA Inc. [Member] | Preferred Stock Of Subsidiary And Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2010 | $ 275 | $ 3,064 | $ 2,124 | $ (406) | $ (2,225) | $ 2,832 | $ 14 | $ 2,832
Beginning Balance (in shares) at Dec. 31, 2010 | 274,719,578 |  |  |  | (74,973,978) |  | 1,426 |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income (loss) |  |  | (693) |  |  | (693) |  | (693)
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Change in unrealized gains and losses on investments net of tax of $117 |  |  |  | 257 |  | 257 |  |
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, net of tax of $15 |  |  |  | 29 |  | 29 |  |
Change in fair value of derivative instruments net of tax of $3 |  |  |  | 5 |  | 5 |  |
Change in foreign currency translation net of tax of $0 |  |  |  | (33) |  | (33) |  |
Other comprehensive income (loss) |  |  |  |  |  | 258 |  |
Total comprehensive income (loss) |  |  |  |  |  | (435) |  |
Share-based compensation, net of tax of $4 (in shares) | 193,684 |  |  |  | (240,401) |  |  |
Share-based compensation, net of tax of $4 |  | 6 |  |  | (1) | 5 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  | (6,541,076) |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  | (50) | (50) |  |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  | (111) |
Preferred shares of subsidiary acquired |  |  |  |  |  |  | (2) |
Change in noncontrolling interest in subsidiary |  |  |  |  |  |  | 11 |
Significant Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Change in unrealized gains and losses and other-than-temporary impairments on investments arising during the period, net of taxes |  |  |  |  |  |  |  | 321
Reclassification adjustment, net of taxes |  |  |  |  |  |  |  | (35)
Change in net unrealized gains and losses, net of taxes |  |  |  |  |  |  |  | 286
Ending Balance at Sep. 30, 2011 | $ 275 | $ 3,070 | $ 1,431 | $ (148) | $ (2,276) | $ 2,352 | $ 23 | $ 2,352
Ending Balance (in shares) at Sep. 30, 2011 | 274,913,262 |  |  |  | (81,755,455) |  | 1,315 |

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