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Consolidated Statement Of Changes In Shareholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Millions | Total | Preferred Stock [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, 2017 | $ 1,425 | $ 12 | $ 1,413 | $ 284 | $ 3,171 | $ 1,095 | $ (19) | $ (3,118)
Balance (in common stock shares) at Dec. 31, 2017 | 283,717,973 |  |  | 283,717,973 |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2017 | (192,233,526) |  |  |  |  |  |  | (192,233,526)
Balance (in preferred stock shares) at Dec. 31, 2017 | 0 | 1,315 |  |  |  |  |  |
Cumulative effect of prospective application of new accounting principle | ASU 2016-01 [Member] |  |  |  |  |  | 164 | (164) |
Cumulative effect of prospective application of new accounting principle | ASU 2018-02 [Member] | $ 3 |  |  |  |  | 3 | (3) |
Net income (loss) | (244) |  | (244) |  |  | (244) |  |
Total other comprehensive income (loss) | (69) |  | (69) |  |  |  | (69) |
Share-based compensation | 4 |  | 4 | $ 0 | 4 |  |  | $ 0
Share-based compensation (in shares) |  |  |  | (92,284) |  |  |  | (46,081)
Treasury shares issued | $ 13 |  | 13 |  | (21) |  |  | $ 34
Treasury shares issued (in shares) | 1,300,000 |  |  |  |  |  |  | 1,277,620
Treasury shares acquired | $ (14) |  | (14) |  |  |  |  | $ (14)
Treasury shares acquired (in shares) |  |  |  |  |  |  |  | (1,961,711)
Total equity balance at Jun. 30, 2018 | $ 1,115 | $ 12 | $ 1,103 | $ 284 | $ 3,154 | $ 1,018 | $ (255) | $ (3,098)
Balance (in common stock shares) at Jun. 30, 2018 | 283,625,689 |  |  | 283,625,689 |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2018 | (192,963,698) |  |  |  |  |  |  | (192,963,698)
Balance (in preferred stock shares) at Jun. 30, 2018 | 0 | 1,315 |  |  |  |  |  |

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