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Consolidated Statement Of Changes In Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | MBIA Inc. [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Preferred Stock Of Subsidiary And Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2008 | $ 994 | $ 273 | $ 3,051 | $ 1,629 | $ (1,776) | $ (2,183) | $ 28 |
Balance (in shares) at Dec. 31, 2008 |  | 273,199,801 |  |  |  | (65,278,904) | 2,759 |
ASC 944-20 transition adjustment, net of tax of $27 | 55 |  |  | 55 |  |  |  |
ASC 320-10 transition adjustment, net of tax of $30 | 30 |  |  | 86 | (56) |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income (loss) | 634 |  |  | 634 |  |  |  | 634
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Change in unrealized gains and losses on investments, net of tax | 1,075 |  |  |  | 1,075 |  |  |
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, net of tax | (264) |  |  |  | (264) |  |  |
Change in fair value of derivative instruments, net of tax | 85 |  |  |  | 85 |  |  |
Change in foreign currency translation, net of tax | (5) |  |  |  | (5) |  |  |
Other comprehensive income (loss) | 891 |  |  |  |  |  |  |
Total comprehensive income (loss) | 1,525 |  |  |  |  |  |  |
Share-based compensation, net of tax (in shares) |  | 1,627,071 |  |  |  | 85,280 |  |
Share-based compensation, net of tax | 12 | 2 | 7 |  |  | 3 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (4,965,400) |  |
Treasury shares acquired under share repurchase program | (15) |  |  |  |  | (15) |  |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  | (1,082) |
Preferred shares of subsidiary acquired |  |  |  |  |  |  | (11) |
Preferred stock dividends of subsidiary | (11) |  |  | (11) |  |  |  | (11)
Significant Accounting Policies: |  |  |  |  |  |  |  |
Change in unrealized gains and losses and other-than-temporary impairments on investments arising during the period, net of tax |  |  |  |  |  |  |  | 283
Reclassification adjustment, net of tax |  |  |  |  |  |  |  | 528
Change in net unrealized gains and losses and other-than-temporary impairment losses, net of taxes |  |  |  |  |  |  |  | 811
Balance at Dec. 31, 2009 | 2,590 | 275 | 3,058 | 2,393 | (941) | (2,195) | 17 |
Balance (in shares) at Dec. 31, 2009 |  | 274,826,872 |  |  |  | (70,159,024) | 1,677 |
ASU 2009-17 transition adjustment: |  |  |  |  |  |  |  |
Consolidated variable interest entities, net of tax of $23 | (55) |  |  | (319) | 264 |  |  |
Deconsolidated variable interest entities, net of tax of $2 | 82 |  |  | (3) | 85 |  |  |
Total ASU 2009-17 transition adjustment | 27 |  |  | (322) | 349 |  |  |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income (loss) | 53 |  |  | 53 |  |  |  | 53
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Change in unrealized gains and losses on investments, net of tax | 322 |  |  |  | 322 |  |  |
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, net of tax | (7) |  |  |  | (7) |  |  |
Change in fair value of derivative instruments, net of tax | 14 |  |  |  | 14 |  |  |
Change in foreign currency translation, net of tax | (143) |  |  |  | (143) |  |  |
Other comprehensive income (loss) | 186 |  |  |  |  |  |  |
Total comprehensive income (loss) | 239 |  |  |  |  |  |  |
Share-based compensation, net of tax (in shares) |  | (107,294) |  |  |  | (78,654) |  |
Share-based compensation, net of tax | 7 |  | 6 |  |  | 1 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (4,736,300) |  |
Treasury shares acquired under share repurchase program | (31) |  |  |  |  | (31) |  |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  | (251) |
Preferred shares of subsidiary acquired |  |  |  |  |  |  | (3) |
Significant Accounting Policies: |  |  |  |  |  |  |  |
Change in unrealized gains and losses and other-than-temporary impairments on investments arising during the period, net of tax |  |  |  |  |  |  |  | 121
Reclassification adjustment, net of tax |  |  |  |  |  |  |  | 194
Change in net unrealized gains and losses and other-than-temporary impairment losses, net of taxes |  |  |  |  |  |  |  | 315
Balance at Dec. 31, 2010 | 2,832 | 275 | 3,064 | 2,124 | (406) | (2,225) | 14 | 2,832
Balance (in shares) at Dec. 31, 2010 |  | 274,719,578 |  |  |  | (74,973,978) | 1,426 |
Comprehensive income (loss): |  |  |  |  |  |  |  |
Net income (loss) | (1,319) |  |  | (1,319) |  |  |  | (1,319)
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Change in unrealized gains and losses on investments, net of tax | 252 |  |  |  | 252 |  |  |
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, net of tax | 6 |  |  |  | 6 |  |  |
Change in fair value of derivative instruments, net of tax | 5 |  |  |  | 5 |  |  |
Change in foreign currency translation, net of tax | (33) |  |  |  | (33) |  |  |
Other comprehensive income (loss) | 230 |  |  |  |  |  |  |
Total comprehensive income (loss) | (1,089) |  |  |  |  |  |  |
Share-based compensation, net of tax (in shares) |  | 176,584 |  |  |  | (237,912) |  |
Share-based compensation, net of tax | 7 |  | 8 |  |  | (1) |  |
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: |  |  |  |  |  |  |  |
Change in unrealized gains and losses and other-than-temporary impairments on investments arising during the period, net of tax |  |  |  |  |  |  |  | 218
Reclassification adjustment, net of tax |  |  |  |  |  |  |  | 40
Change in net unrealized gains and losses and other-than-temporary impairment losses, net of taxes |  |  |  |  |  |  |  | 258
Balance at Dec. 31, 2011 | $ 1,700 | $ 275 | $ 3,072 | $ 805 | $ (176) | $ (2,276) | $ 23 | $ 1,700
Balance (in shares) at Dec. 31, 2011 |  | 274,896,162 |  |  |  | (81,752,966) | 1,315 |

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