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Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Millions, except Share data, unless otherwise specified | Total | 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]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 2,607 | $ 275 | $ 3,058 | $ 2,393 | $ (941) | $ (2,195) | $ 2,590 | $ 17
Beginning 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 | (55) |  |  | (319) | 264 |  | (55) |
Deconsolidated variable interest entities, net of tax | 82 |  |  | (3) | 85 |  | 82 |
Total ASU 2009-17 transition adjustment | 27 |  |  | (322) | 349 |  | 27 |
Net income | 53 |  |  | 53 |  |  | 53 |
Other comprehensive income | 186 |  |  |  | 186 |  | 186 |
Share-based compensation, net of tax (in shares) |  | (107,294) |  |  |  | (78,654) |  |
Share-based compensation, net of tax | 7 |  | 6 |  |  | 1 | 7 |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (4,736,300) |  |
Treasury shares acquired under share repurchase program | (31) |  |  |  |  | (31) | (31) |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  |  | (251)
Preferred shares of subsidiary acquired | (3) |  |  |  |  |  |  | (3)
Ending Balance at Dec. 31, 2010 | 2,846 | 275 | 3,064 | 2,124 | (406) | (2,225) | 2,832 | 14
Ending Balance (in shares) at Dec. 31, 2010 |  | 274,719,578 |  |  |  | (74,973,978) |  | 1,426
ASU 2009-17 transition adjustment: |  |  |  |  |  |  |  |
Net income | (1,319) |  |  | (1,319) |  |  | (1,319) |
Other comprehensive income | 230 |  |  |  | 230 |  | 230 |
Share-based compensation, net of tax (in shares) |  | 176,584 |  |  |  | (237,912) |  |
Share-based compensation, net of tax | 7 |  | 8 |  |  | (1) | 7 |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (6,541,076) |  |
Treasury shares acquired under share repurchase program | (50) |  |  |  |  | (50) | (50) |
Preferred shares of subsidiary acquired (in shares) |  |  |  |  |  |  |  | (111)
Preferred shares of subsidiary acquired | (2) |  |  |  |  |  |  | (2)
Change in noncontrolling interest in subsidiary | 11 |  |  |  |  |  |  | 11
Ending Balance at Dec. 31, 2011 | 1,723 | 275 | 3,072 | 805 | (176) | (2,276) | 1,700 | 23
Ending Balance (in shares) at Dec. 31, 2011 |  | 274,896,162 |  |  |  | (81,752,966) |  | 1,315
ASU 2009-17 transition adjustment: |  |  |  |  |  |  |  |
Net income | 1,234 |  |  | 1,234 |  |  | 1,234 |
Other comprehensive income | 232 |  |  |  | 232 |  | 232 |
Share-based compensation, net of tax (in shares) |  | 2,508,877 |  |  |  | 19,436 |  |
Share-based compensation, net of tax | 7 | 2 | 4 |  |  | 1 | 7 |
Change in noncontrolling interest in subsidiary | (2) |  |  |  |  |  |  | (2)
Ending Balance at Dec. 31, 2012 | $ 3,194 | $ 277 | $ 3,076 | $ 2,039 | $ 56 | $ (2,275) | $ 3,173 | $ 21
Ending Balance (in shares) at Dec. 31, 2012 |  | 277,405,039 |  |  |  | (81,733,530) |  | 1,315

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