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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 [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Total Shareholders' Equity Of MBIA Inc. [Member] | Preferred Stock [Member] | Preferred Stock And Non Controlling Interest Held For Sale [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in common stock shares) |  | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) |  |  |  |  |  |  |  | 1,315 |
Total equity balance at Dec. 31, 2021 |  | $ 283 | $ 2,931 | $ (458) | $ 100 | $ (3,169) | $ (313) |  | $ 13
Balance (in treasury stock shares) at Dec. 31, 2021 |  |  |  |  |  | (228,630,003) |  |  |
Net income (loss) attributable to MBIA Inc. | $ (143) |  |  | (143) |  |  |  |  |
Other comprehensive income (loss) | (414) |  |  |  | (414) |  |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ 0 |  |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | 0 |  |  |
Other |  |  |  |  |  | $ 17 |  |  |
Others (in shares) |  |  |  |  |  | 344,097 |  |  |
Period change |  |  | (10) |  |  |  | (550) |  | 1
Total equity balance at Sep. 30, 2022 | (849) | $ 283 | 2,921 | (601) | (314) | $ (3,152) | (863) |  | 14
Balance (in treasury stock shares) at Sep. 30, 2022 |  |  |  |  |  | (228,285,906) |  |  |
Balance (in common stock shares) |  | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) |  |  |  |  |  |  |  | 1,315 |
Total equity balance at Jun. 30, 2022 |  | $ 283 | 2,919 | (567) | (231) | $ (3,152) | (748) |  | 13
Balance (in treasury stock shares) at Jun. 30, 2022 |  |  |  |  |  | (228,286,399) |  |  |
Net income (loss) attributable to MBIA Inc. | (34) |  |  | (34) |  |  |  |  |
Other comprehensive income (loss) | (83) |  |  |  | (83) |  |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ 0 |  |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | 0 |  |  |
Other |  |  |  |  |  | $ 0 |  |  |
Others (in shares) |  |  |  |  |  | 493 |  |  |
Period change |  |  | 2 |  |  |  | (115) |  | 1
Total equity balance at Sep. 30, 2022 | $ (849) | $ 283 | 2,921 | (601) | (314) | $ (3,152) | (863) |  | 14
Balance (in treasury stock shares) at Sep. 30, 2022 |  |  |  |  |  | (228,285,906) |  |  |
Balance (in common stock shares) |  | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) |  |  |  |  |  |  |  | 1,315 |
Balance (in common stock shares) | 283,186,115 | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) | 0 |  |  |  |  |  |  | 1,315 |
Total equity balance at Dec. 31, 2022 | $ (876) | $ 283 | 2,925 | (653) | (283) | $ (3,154) | (882) |  | 6
Balance (in treasury stock shares) at Dec. 31, 2022 | (228,333,444) |  |  |  |  | (228,333,444) |  |  |
Net income (loss) attributable to MBIA Inc. | $ (353) |  |  | (353) |  |  |  |  |
Other comprehensive income (loss) | 20 |  |  |  | 20 |  |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (29) |  |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (3,568,886) |  |  |
Other |  |  |  |  |  | $ 11 |  |  |
Others (in shares) |  |  |  |  |  | (144,545) |  |  |
Period change |  |  | (6) |  |  |  | (357) |  | 5
Total equity balance at Sep. 30, 2023 | $ (1,228) | $ 283 | 2,919 | (1,006) | (263) | $ (3,172) | (1,239) |  | 11
Balance (in treasury stock shares) at Sep. 30, 2023 | (232,046,875) |  |  |  |  | (232,046,875) |  |  |
Balance (in common stock shares) |  | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) |  |  |  |  |  |  |  | 1,315 |
Total equity balance at Jun. 30, 2023 |  | $ 283 | 2,915 | (821) | (213) | $ (3,165) | (1,001) |  | 12
Balance (in treasury stock shares) at Jun. 30, 2023 |  |  |  |  |  | (231,143,200) |  |  |
Net income (loss) attributable to MBIA Inc. | $ (185) |  |  | (185) |  |  |  |  |
Other comprehensive income (loss) | (50) |  |  |  | (50) |  |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (6) |  |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (672,066) |  |  |
Other |  |  |  |  |  | $ (1) |  |  |
Others (in shares) |  |  |  |  |  | (231,609) |  |  |
Period change |  |  | 0 |  |  |  | (238) |  | (1)
Total equity balance at Sep. 30, 2023 | $ (1,228) | $ 283 | $ 2,919 | $ (1,006) | $ (263) | $ (3,172) | $ (1,239) |  | $ 11
Balance (in treasury stock shares) at Sep. 30, 2023 | (232,046,875) |  |  |  |  | (232,046,875) |  |  |
Balance (in common stock shares) | 283,186,115 | 283,186,115 |  |  |  |  |  |  |
Balance (in preferred stock shares) | 0 |  |  |  |  |  |  | 1,315 |

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