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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) |  |
Balance (in preferred stock shares) at Dec. 31, 2018 |  |  |  |  |  |  |  | 1,315
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | $ (145) |  |  | (145) |  |  |  |
Other comprehensive income (loss) | 142 |  |  |  | 142 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (93) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (10,273,891) |  |
Other |  |  |  |  |  | $ 40 |  |
Others (in shares) |  |  |  |  |  | 920,108 |  |
Period change |  |  | (28) |  |  |  | (84) |
Total equity balance at Sep. 30, 2019 | 1,048 | $ 284 | 2,997 | 821 | (14) | $ (3,053) | 1,035 | $ 13
Balance (in treasury stock shares) at Sep. 30, 2019 |  |  |  |  |  | (203,157,759) |  |
Total equity balance at Jun. 30, 2019 |  |  | 2,995 | 738 | 37 | $ (3,014) | 1,040 |
Balance (in common stock shares) at Jun. 30, 2019 |  | 283,625,689 |  |  |  |  |  |
Balance (in treasury stock shares) at Jun. 30, 2019 |  |  |  |  |  | (198,824,693) |  |
Balance (in preferred stock shares) at Jun. 30, 2019 |  |  |  |  |  |  |  | 1,315
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | 83 |  |  | 83 |  |  |  |
Other comprehensive income (loss) | (51) |  |  |  | (51) |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (39) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (4,341,232) |  |
Other |  |  |  |  |  | $ 0 |  |
Others (in shares) |  |  |  |  |  | 8,166 |  |
Period change |  |  | 2 |  |  |  | (5) |
Total equity balance at Sep. 30, 2019 | 1,048 | $ 284 | 2,997 | 821 | (14) | $ (3,053) | 1,035 | $ 13
Balance (in treasury stock shares) at Sep. 30, 2019 |  |  |  |  |  | (203,157,759) |  |
Total equity balance at Dec. 31, 2019 | $ 839 |  | 2,999 | 607 | (2) | $ (3,061) | 826 |
Balance (in common stock shares) at Dec. 31, 2019 | 283,433,401 |  |  |  |  |  |  |
Balance (in treasury stock shares) at Dec. 31, 2019 | (204,000,108) |  |  |  |  | (204,000,108) |  |
Balance (in preferred stock shares) at Dec. 31, 2019 | 0 |  |  |  |  |  |  | 1,315
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | (42) |  |  |  |
Net income (loss) | $ (497) |  |  | (497) |  |  |  |
Other comprehensive income (loss) | 132 |  |  |  | 132 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (198) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (26,430,768) |  |
Other |  |  |  |  |  | $ 48 |  |
Others (in shares) |  |  |  |  |  | 924,913 |  |
Period change |  |  | (39) |  |  |  | (596) |
Total equity balance at Sep. 30, 2020 | $ 243 | $ 283 | 2,960 | 68 | 130 | $ (3,211) | 230 | $ 13
Balance (in common stock shares) at Sep. 30, 2020 | 283,433,401 | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Sep. 30, 2020 | (229,505,963) |  |  |  |  | (229,505,963) |  |
Total equity balance at Jun. 30, 2020 |  |  | 2,959 | 126 | 129 | $ (3,149) | 348 |
Balance (in treasury stock shares) at Jun. 30, 2020 |  |  |  |  |  | (220,924,081) |  |
Balance (in preferred stock shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 1,315
ASU 2016-13 transition adjustment | ASU 2016-13 [Member] |  |  |  | 0 |  |  |  |
Net income (loss) | $ (58) |  |  | (58) |  |  |  |
Other comprehensive income (loss) | 1 |  |  |  | 1 |  |  |
Treasury shares acquired under share repurchase program |  |  |  |  |  | $ (62) |  |
Treasury shares acquired under share repurchase program (in shares) |  |  |  |  |  | (8,582,686) |  |
Other |  |  |  |  |  | $ 0 |  |
Others (in shares) |  |  |  |  |  | 804 |  |
Period change |  |  | 1 |  |  |  | (118) |
Total equity balance at Sep. 30, 2020 | $ 243 | $ 283 | $ 2,960 | $ 68 | $ 130 | $ (3,211) | $ 230 | $ 13
Balance (in common stock shares) at Sep. 30, 2020 | 283,433,401 | 283,433,401 |  |  |  |  |  |
Balance (in treasury stock shares) at Sep. 30, 2020 | (229,505,963) |  |  |  |  | (229,505,963) |  |

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