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Consolidated Statement Of Changes In Shareholders' Equity - 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, 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 |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2015 |  |  |  |  |  |  |  | (130,303,241)
Balance (in preferred stock shares) at Dec. 31, 2015 |  | 1,315 |  |  |  |  |  |
Net income (loss) | (338) |  | (338) |  |  | (338) |  |
Total other comprehensive income (loss) | (67) |  | (67) |  |  |  | (67) |
Share-based compensation, net of tax | 8 |  | 8 | $ 2 | 22 |  |  | $ (16)
Share-based compensation (in shares) |  |  |  | 2,156,381 |  |  |  | (1,925,990)
Treasury shares acquired | (105) |  | (105) |  |  |  |  | $ (105)
Treasury shares acquired (in shares) |  |  |  |  |  |  |  | (16,559,937)
Total equity balance at Dec. 31, 2016 | 3,239 | $ 12 | 3,227 | $ 284 | 3,160 | 2,700 | (128) | $ (2,789)
Balance (in common stock shares) at Dec. 31, 2016 |  |  |  | 283,989,999 |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2016 |  |  |  |  |  |  |  | (148,789,168)
Balance (in preferred stock shares) at Dec. 31, 2016 |  | 1,315 |  |  |  |  |  |
Net income (loss) | (1,605) |  | (1,605) |  |  | (1,605) |  |
Total other comprehensive income (loss) | 109 |  | 109 |  |  |  | 109 |
Share-based compensation, net of tax | 7 |  | 7 | $ 0 | 11 |  |  | $ (4)
Share-based compensation (in shares) |  |  |  | (272,026) |  |  |  | (402,707)
Treasury shares acquired | $ (325) |  | (325) |  |  |  |  | $ (325)
Treasury shares acquired (in shares) | (43,000,000) |  |  |  |  |  |  | (43,041,651)
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) | (296) |  | (296) |  |  | (296) |  |
Total other comprehensive income (loss) | 30 |  | 30 |  |  |  | 30 |
Share-based compensation, net of tax | 7 |  | 7 | $ 0 | (125) |  |  | $ 132
Share-based compensation (in shares) |  |  |  | (92,284) |  |  |  | 2,994,497
Treasury shares issued | $ 13 |  | 13 |  | (21) |  |  | $ 34
Treasury shares issued (in shares) | 1,300,000 |  |  |  |  |  |  | 1,277,620
Treasury shares acquired | $ (48) |  | (48) |  |  |  |  | $ (48)
Treasury shares acquired (in shares) | (5,800,000) |  |  |  |  |  |  | (5,842,567)
Other | $ 1 | $ 1 |  |  |  |  |  |
Total equity balance at Dec. 31, 2018 | $ 1,132 | $ 13 | $ 1,119 | $ 284 | $ 3,025 | $ 966 | $ (156) | $ (3,000)
Balance (in common stock shares) at Dec. 31, 2018 | 283,625,689 |  |  | 283,625,689 |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2018 | (193,803,976) |  |  |  |  |  |  | (193,803,976)
Balance (in preferred stock shares) at Dec. 31, 2018 | 0 | 1,315 |  |  |  |  |  |

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