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Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings (deficit) [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, 2019 |  | $ 283 | $ 2,999 | $ 607 | $ (2) | $ (3,061) | $ 826 |
Balance (in treasury stock shares) at Dec. 31, 2019 |  |  |  |  |  | (204,000,108) |  |
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member] |  |  |  | (42) |  |  |  |
Net income (loss) | $ (439) |  |  | (439) |  |  |  |
Other comprehensive income (loss) | 131 |  |  |  | 131 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (136) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (17,848,082) |  |
Other |  |  |  |  |  | $ 48 |  |
Others (in shares) |  |  |  |  |  | 924,109 |  |
Period change |  |  | (41) |  |  |  | (479) |
Total equity balance at Jun. 30, 2020 | 360 |  | 2,958 | 126 | 129 | $ (3,149) | 347 | $ 13
Balance (in common stock shares) at Jun. 30, 2020 |  | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2020 |  |  |  |  |  | (220,924,081) |  |
Balance (in preferred stock shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 1,315
Total equity balance at Mar. 31, 2020 |  | $ 283 | 2,961 | 232 | 91 | $ (3,083) | 484 |
Balance (in treasury stock shares) at Mar. 31, 2020 |  |  |  |  |  | (211,272,995) |  |
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | (106) |  |  | (106) |  |  |  |
Other comprehensive income (loss) | 38 |  |  |  | 38 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (71) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (9,765,326) |  |
Other |  |  |  |  |  | $ 5 |  |
Others (in shares) |  |  |  |  |  | 114,240 |  |
Period change |  |  | (3) |  |  |  | (137) |
Total equity balance at Jun. 30, 2020 | 360 |  | 2,958 | 126 | 129 | $ (3,149) | 347 | $ 13
Balance (in common stock shares) at Jun. 30, 2020 |  | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2020 |  |  |  |  |  | (220,924,081) |  |
Balance (in preferred stock shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 1,315
Total equity balance at Dec. 31, 2020 | $ 149 | $ 283 | 2,962 | (13) | 115 | $ (3,211) | 136 |
Balance (in treasury stock shares) at Dec. 31, 2020 | (229,508,967) |  |  |  |  | (229,508,967) |  |
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | $ (167) |  |  | (167) |  |  |  |
Other comprehensive income (loss) | (12) |  |  |  | (12) |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ 0 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | 0 |  |
Other |  |  |  |  |  | $ 35 |  |
Others (in shares) |  |  |  |  |  | 728,427 |  |
Period change |  |  | (28) |  |  |  | (172) |
Total equity balance at Jun. 30, 2021 | $ (23) |  | 2,934 | (180) | 103 | $ (3,176) | (36) | $ 13
Balance (in common stock shares) at Jun. 30, 2021 | 283,186,115 | 283,186,115 |  |  |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2021 | (228,780,540) |  |  |  |  | (228,780,540) |  |
Balance (in preferred stock shares) at Jun. 30, 2021 | 0 |  |  |  |  |  |  | 1,315
Total equity balance at Mar. 31, 2021 |  | $ 283 | 2,934 | (119) | 39 | $ (3,179) | (42) |
Balance (in treasury stock shares) at Mar. 31, 2021 |  |  |  |  |  | (228,837,465) |  |
Cumulative effect of prospective application of new accounting principle | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | $ (61) |  |  | (61) |  |  |  |
Other comprehensive income (loss) | 64 |  |  |  | 64 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ 0 |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | 0 |  |
Other |  |  |  |  |  | $ 3 |  |
Others (in shares) |  |  |  |  |  | 56,925 |  |
Period change |  |  | 0 |  |  |  | 6 |
Total equity balance at Jun. 30, 2021 | $ (23) |  | $ 2,934 | $ (180) | $ 103 | $ (3,176) | $ (36) | $ 13
Balance (in common stock shares) at Jun. 30, 2021 | 283,186,115 | 283,186,115 |  |  |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2021 | (228,780,540) |  |  |  |  | (228,780,540) |  |
Balance (in preferred stock shares) at Jun. 30, 2021 | 0 |  |  |  |  |  |  | 1,315

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