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Consolidated Statements Of Changes In Shareholders' Equity (Unaudited) - USD ($) $ in Millions | Total | 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 [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Total equity balance at Dec. 31, 2018 |  | $ 284 | $ 3,025 | $ 966 | $ (156) | $ (3,000) | $ 1,119 |
Balance (in common stock shares) at Dec. 31, 2018 |  | 283,625,689 |  |  |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2018 |  |  |  |  |  | (193,803,976) |  |
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | $ (21) |  |  | (21) |  |  |  |
Other comprehensive income (loss) | 86 |  |  |  | 86 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (4) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (487,606) |  |
Other |  |  |  |  |  | $ 37 |  |
Others (in shares) |  |  |  |  |  | 845,414 |  |
Period change |  |  | (29) |  |  |  | 69 |
Total equity balance at Mar. 31, 2019 | 1,201 |  | 2,996 | 945 | (70) | $ (2,967) | 1,188 | $ 13
Balance (in common stock shares) at Mar. 31, 2019 |  | 283,625,689 |  |  |  |  |  |
Balance (in treasury stock shares) at Mar. 31, 2019 |  |  |  |  |  | (193,446,168) |  |
Balance (in preferred stock shares) at Mar. 31, 2019 |  |  |  |  |  |  |  | 1,315
Total equity balance at Dec. 31, 2019 | $ 839 | $ 283 | 2,999 | 607 | (2) | $ (3,061) | 826 |
Balance (in common stock shares) at Dec. 31, 2019 | 283,433,401 | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2019 | (204,000,108) |  |  |  |  | (204,000,108) |  |
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | (42) |  |  |  |
Net income (loss) | $ (333) |  |  | (333) |  |  |  |
Other comprehensive income (loss) | 93 |  |  |  | 93 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (65) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (8,082,756) |  |
Other |  |  |  |  |  | $ 43 |  |
Others (in shares) |  |  |  |  |  | 809,869 |  |
Period change |  |  | (38) |  |  |  | (342) |
Total equity balance at Mar. 31, 2020 | $ 497 |  | $ 2,961 | $ 232 | $ 91 | $ (3,083) | $ 484 | $ 13
Balance (in common stock shares) at Mar. 31, 2020 | 283,433,401 | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Mar. 31, 2020 | (211,272,995) |  |  |  |  | (211,272,995) |  |
Balance (in preferred stock shares) at Mar. 31, 2020 | 0 |  |  |  |  |  |  | 1,315

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