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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $120 and $131) | $ 1,236 | $ 1,557 |  |
Total assets | 2,168 | 2,606 | $ 3,375 |
Liabilities: |  |  |  |
Total liabilities | 4,244 | 4,253 |  |
Equity: |  |  |  |
Preferred stock, par value $1 per share; authorized shares—10,000,000; issued and outstanding—none | 0 | 0 |  |
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--283,186,115 and 283,186,115 | 283 | 283 |  |
Additional paid-in capital | 2,492 | 2,515 |  |
Retained earnings (deficit) | (1,591) | (1,144) |  |
Accumulated other comprehensive income (loss), net of tax | (128) | (139) | (283) | $ 100
Treasury stock, at cost--232,215,934 and 232,323,184 shares | (3,145) | (3,172) |  |
Total shareholders' equity of MBIA Inc. | (2,089) | (1,657) |  |
Total liabilities and equity | 2,168 | $ 2,606 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | $ 1,391 |  |  |
Preferred stock, par value | $ 1 | $ 1 |  |
Preferred stock, authorized shares | 10,000,000 | 10,000,000 |  |
Preferred stock, issued | 0 | 0 |  |
Preferred stock, outstanding | 0 | 0 |  |
Common stock, par value | $ 1 | $ 1 |  |
Common stock, authorized shares | 400,000,000 | 400,000,000 |  |
Common stock, issued shares | 283,186,115 | 283,186,115 |  |
Treasury stock, shares | 232,215,934 | 232,323,184 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $120 and $131) | $ 114 | $ 127 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $445 and $480) | 445 | 480 |  |
Total investments | 559 | 607 |  |
Cash and cash equivalents | 32 | 33 | $ 16 | $ 15
Other assets | 1 | 26 |  |
Total assets | 592 | 666 |  |
Liabilities: |  |  |  |
Investment agreements | 204 | 221 |  |
Long-term debt | 278 | 278 |  |
Affiliate loans payable | 478 | 533 |  |
Accumulated loss of wholly-owned subsidiaries | 1,721 | 1,290 |  |
Other liabilities | 0 | 1 |  |
Total liabilities | 2,681 | 2,323 |  |
Equity: |  |  |  |
Preferred stock, par value $1 per share; authorized shares—10,000,000; issued and outstanding—none | 0 | 0 |  |
Common stock, par value $1 per share; authorized shares--400,000,000; issued shares--283,186,115 and 283,186,115 | 283 | 283 |  |
Additional paid-in capital | 2,492 | 2,515 |  |
Retained earnings (deficit) | (1,591) | (1,144) |  |
Accumulated other comprehensive income (loss), net of tax | (128) | (139) |  |
Treasury stock, at cost--232,215,934 and 232,323,184 shares | (3,145) | (3,172) |  |
Total shareholders' equity of MBIA Inc. | (2,089) | (1,657) |  |
Total liabilities and equity | 592 | 666 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 120 | 131 |  |
Short-term investments, amortized cost | $ 445 | $ 480 |  |
Preferred stock, par value | $ 1 | $ 1 |  |
Preferred stock, authorized shares | 10,000,000 | 10,000,000 |  |
Preferred stock, issued | 0 | 0 |  |
Preferred stock, outstanding | 0 | 0 |  |
Common stock, par value | $ 1 | $ 1 |  |
Common stock, authorized shares | 400,000,000 | 400,000,000 |  |
Common stock, issued shares | 283,186,115 | 283,186,115 |  |
Treasury stock, shares | 232,215,934 | 232,323,184 |  |

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