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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $131 and $463) | $ 1,557 | $ 1,931 |  |
Total assets | 2,606 | 3,375 |  |
Liabilities: |  |  |  |
Total liabilities | 4,253 | 4,251 |  |
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 | 2,515 | 2,925 |  |
Retained earnings (deficit) | (1,144) | (653) |  |
Accumulated other comprehensive income (loss), net of tax | (139) | (283) | $ 100 | $ 115
Treasury stock, at cost--232,323,184 and 228,333,444 shares | (3,172) | (3,154) |  |
Total shareholders' equity of MBIA Inc. | (1,657) | (882) |  |
Total liabilities and equity | 2,606 | $ 3,375 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | $ 1,688 |  |  |
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 | 232,323,184 | 228,333,444 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $131 and $463) | $ 127 | $ 431 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $480 and $95) | 480 | 95 |  |
Total investments | 607 | 526 |  |
Cash and cash equivalents | 33 | 16 | $ 15 | $ 26
Other assets | 26 | 9 |  |
Total assets | 666 | 551 |  |
Liabilities: |  |  |  |
Investment agreements | 221 | 233 |  |
Long-term debt | 278 | 278 |  |
Affiliate loans payable | 533 | 535 |  |
Derivative liabilities | 1 | 48 |  |
Accumulated loss of wholly-owned subsidiaries | 1,290 | 333 |  |
Other liabilities | 0 | 6 |  |
Total liabilities | 2,323 | 1,433 |  |
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 | 2,515 | 2,925 |  |
Retained earnings (deficit) | (1,144) | (653) |  |
Accumulated other comprehensive income (loss), net of tax | (139) | (283) |  |
Treasury stock, at cost--232,323,184 and 228,333,444 shares | (3,172) | (3,154) |  |
Total shareholders' equity of MBIA Inc. | (1,657) | (882) |  |
Total liabilities and equity | 666 | 551 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 131 | 463 |  |
Short-term investments, amortized cost | $ 480 | $ 95 |  |
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 | 232,323,184 | 228,333,444 |  |

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