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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 And Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 275 | $ 3,072 | $ 805 | $ (176) | $ (2,276) | $ 1,700 | $ 23 | $ 1,723
Beginning Balance (in shares) at Dec. 31, 2011 | 274,896,162 |  |  |  | (81,752,966) |  | 1,315 |
Net income |  |  | 10 |  |  | 10 |  | 10
Other comprehensive income (loss) |  |  |  | 150 |  | 150 |  | 150
Share-based compensation net of tax of $5 (in Shares) | 592,752 |  |  |  | 2,839 |  |  |
Share-based compensation net of tax of $5 |  | (2) |  |  |  | (2) |  | (2)
Ending balance at Mar. 31, 2012 | $ 275 | $ 3,070 | $ 815 | $ (26) | $ (2,276) | $ 1,858 | $ 23 | $ 1,881
Ending Balance (in shares) at Mar. 31, 2012 | 275,488,914 |  |  |  | (81,750,127) |  | 1,315 |

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