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Consolidated Statement 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 [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) |  |  | (1,138) |  |  | (1,138) |  | (1,138)
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Change in unrealized gains and losses on investments net of tax of $93 |  |  |  | 217 |  | 217 |  |
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, net of tax of $13 |  |  |  | 24 |  | 24 |  |
Change in fair value of derivative instruments net of tax of $4 |  |  |  | 6 |  | 6 |  |
Change in foreign currency translation net of tax of $5 |  |  |  | (36) |  | (36) |  |
Other comprehensive income (loss) |  |  |  |  |  | 211 |  |
Total comprehensive income (loss) |  |  |  |  |  | (927) |  |
Share-based compensation, net of tax of $4 (in shares) | 202,773 |  |  |  | (146,172) |  |  |
Share-based compensation, net of tax of $4 |  | 2 |  |  | (1) | 1 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  | (3,021,722) |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  | (25) | (25) |  |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  | (41) |
Preferred shares of subsidiary acquired |  |  |  |  |  |  | (1) |
Change in noncontrolling interest in subsidiary |  |  |  |  |  |  | 11 |
Significant Accounting Policies |  |  |  |  |  |  |  |
Change in unrealized gains and losses and other-than-temporary impairments on investments arising during the period, net of taxes |  |  |  |  |  |  |  | 251
Reclassification adjustment, net of taxes |  |  |  |  |  |  |  | (10)
Change in net unrealized gains and losses and other-than-temporary impairment losses, net of taxes |  |  |  |  |  |  |  | 241
Ending Balance at Jun. 30, 2011 | $ 275 | $ 3,066 | $ 986 | $ (195) | $ (2,251) | $ 1,881 | $ 24 | $ 1,881
Ending Balance (in shares) at Jun. 30, 2011 | 274,922,351 |  |  |  | (78,141,872) |  | 1,385 |

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