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Consolidated Statement Of Changes In Shareholders' Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Millions | Total | Preferred Stock Of Subsidiary [Member] | Total Shareholders' Equity Of MBIA Inc. [Member] | Common Stock [Member] | Additional Paid In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Total equity balance at Dec. 31, 2015 | $ 3,741 | $ 12 | $ 3,729 | $ 282 | $ 3,138 | $ 3,038 | $ (61) | $ (2,668)
Balance (in common stock shares) at Dec. 31, 2015 | 281,833,618 |  |  | 281,833,618 |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2015 | (130,303,241) |  |  |  |  |  |  | (130,303,241)
Balance (in preferred stock shares) at Dec. 31, 2015 | 0 | 1,315 |  |  |  |  |  |
Net income (loss) | $ (105) |  | (105) |  |  | (105) |  |
Other comprehensive income (loss) | 119 |  | 119 |  |  |  | 119 |
Share-based compensation | 8 |  | 8 | $ 2 | 12 |  |  | $ (6)
Share-based compensation (in shares) |  |  |  | 1,654,318 |  |  |  | (981,235)
Treasury shares acquired | (105) |  | (105) |  |  |  |  | $ (105)
Treasury shares acquired (in shares) |  |  |  |  |  |  |  | (16,559,937)
Total equity balance at Jun. 30, 2016 | $ 3,658 | $ 12 | $ 3,646 | $ 284 | $ 3,150 | $ 2,933 | $ 58 | $ (2,779)
Balance (in common stock shares) at Jun. 30, 2016 | 283,487,936 |  |  | 283,487,936 |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2016 | (147,844,413) |  |  |  |  |  |  | (147,844,413)
Balance (in preferred stock shares) at Jun. 30, 2016 | 0 | 1,315 |  |  |  |  |  |

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