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Consolidated Statement Of Changes In Shareholders' Equity - 3 months ended Mar. 31, 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) | (98) |  | (98) |  |  | (98) |  |
Total other comprehensive income (loss) | (55) |  | (55) |  |  |  | (55) |
Share-based compensation | 2 |  | 2 | $ 0 | 3 |  |  | $ (1)
Share-based compensation (in shares) |  |  |  | (148,719) |  |  |  | (48,452)
Treasury shares acquired | (14) |  | (14) |  |  |  |  | $ (14)
Treasury shares acquired (in shares) |  |  |  |  |  |  |  | (1,961,711)
Total equity balance at Mar. 31, 2018 | $ 1,260 | $ 12 | $ 1,248 | $ 284 | $ 3,174 | $ 1,164 | $ (241) | $ (3,133)
Balance (in common stock shares) at Mar. 31, 2018 | 283,569,254 |  |  | 283,569,254 |  |  |  |
Balance (in treasury stock shares) at Mar. 31, 2018 | (194,243,689) |  |  |  |  |  |  | (194,243,689)
Balance (in preferred stock shares) at Mar. 31, 2018 | 0 | 1,315 |  |  |  |  |  |

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