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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 167 | $ 83 | $ 280 | $ 146
Total assets | 5,751 | 7,284 |  |
Liabilities: |  |  |  |
Total liabilities | 5,602 | 6,445 |  |
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 283,433,401 | 283 | 283 |  |
Additional paid-in capital | 2,962 | 2,999 |  |
Retained earnings (deficit) | (13) | 607 |  |
Accumulated other comprehensive income (loss), net of tax | 115 | (2) | (156) | (19)
Treasury stock, at cost—229,508,967 and 204,000,108 shares | (3,211) | (3,061) |  |
Total shareholders' equity of MBIA Inc. | 136 | 826 |  |
Total liabilities and equity | $ 5,751 | $ 7,284 |  |
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 | 283,433,401 |  |
Treasury stock, shares | 229,508,967 | 204,000,108 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $621 and $610) | $ 719 | $ 674 |  |
Investments carried at fair value | 1 | 1 |  |
Investments pledged as collateral, at fair value (amortized cost $10 and $19) | 1 | 11 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $31 and $167) | 31 | 167 |  |
Total investments | 752 | 853 |  |
Cash and cash equivalents | 26 | 11 | $ 40 | $ 10
Investment in wholly-owned subsidiaries | 728 | 1,456 |  |
Other assets | 139 | 123 |  |
Total assets | 1,645 | 2,443 |  |
Liabilities: |  |  |  |
Investment agreements | 269 | 274 |  |
Long-term debt | 312 | 427 |  |
Affiliate loans payable | 695 | 658 |  |
Income taxes payable | 12 | 60 |  |
Derivative liabilities | 164 | 133 |  |
Other liabilities | 57 | 65 |  |
Total liabilities | 1,509 | 1,617 |  |
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 283,433,401 | 283 | 283 |  |
Additional paid-in capital | 2,962 | 2,999 |  |
Retained earnings (deficit) | (13) | 607 |  |
Accumulated other comprehensive income (loss), net of tax | 115 | (2) |  |
Treasury stock, at cost—229,508,967 and 204,000,108 shares | (3,211) | (3,061) |  |
Total shareholders' equity of MBIA Inc. | 136 | 826 |  |
Total liabilities and equity | 1,645 | 2,443 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 621 | 610 |  |
Investments pledged as collateral, amortized cost | 10 | 19 |  |
Short-term investments, amortized cost | $ 31 | $ 167 |  |
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 | 283,433,401 |  |
Treasury stock, shares | 229,508,967 | 204,000,108 |  |

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