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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Total assets | $ 3,375 | $ 4,696 |  |
Liabilities: |  |  |  |
Total liabilities | 4,251 | 4,996 |  |
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 | 2,925 | 2,931 |  |
Retained earnings (deficit) | (653) | (458) |  |
Accumulated other comprehensive income (loss), net of tax | (283) | 100 | $ 115 | $ (2)
Treasury stock, at cost—228,333,444 and 228,630,003 shares | (3,154) | (3,169) |  |
Total shareholders' equity of MBIA Inc. | (882) | (313) |  |
Total liabilities and shareholders' equity | $ 3,375 | $ 4,696 |  |
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 | 228,333,444 | 228,630,003 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $463 and $556) | $ 431 | $ 618 |  |
Investments pledged as collateral, at fair value (amortized cost $- and $3) | 0 | 4 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $95 and $52) | 95 | 52 |  |
Total investments | 526 | 674 |  |
Cash and cash equivalents | 16 | 15 | $ 26 | $ 11
Investment in wholly-owned subsidiaries | 0 | 336 |  |
Other assets | 9 | 5 |  |
Total assets | 551 | 1,030 |  |
Liabilities: |  |  |  |
Investment agreements | 233 | 274 |  |
Long-term debt | 278 | 306 |  |
Affiliate loans payable | 535 | 579 |  |
Income taxes payable | 0 | 3 |  |
Derivative liabilities | 48 | 130 |  |
Accumulated loss of wholly-owned subsidiaries | 333 | 0 |  |
Other liabilities | 6 | 51 |  |
Total liabilities | 1,433 | 1,343 |  |
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 | 2,925 | 2,931 |  |
Retained earnings (deficit) | (653) | (458) |  |
Accumulated other comprehensive income (loss), net of tax | (283) | 100 |  |
Treasury stock, at cost—228,333,444 and 228,630,003 shares | (3,154) | (3,169) |  |
Total shareholders' equity of MBIA Inc. | (882) | (313) |  |
Total liabilities and shareholders' equity | 551 | 1,030 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 463 | 556 |  |
Investments pledged as collateral, amortized cost | 0 | 3 |  |
Short-term investments, amortized cost | $ 95 | $ 52 |  |
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 | 228,333,444 | 228,630,003 |  |

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