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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 83 | $ 280 | $ 146 | $ 187
Total assets | 7,284 | 8,107 |  |
Liabilities: |  |  |  |
Long-term debt | 2,228 | 2,249 |  |
Total liabilities | 6,445 | 6,975 |  |
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—283,433,401 and 283,625,689 | 283 | 284 |  |
Additional paid-in capital | 2,999 | 3,025 |  |
Retained earnings | 607 | 966 |  |
Accumulated other comprehensive income (loss), net of tax | (2) | (156) | (19) | (128)
Treasury stock, at cost—203,157,759 and 193,803,976 shares | (3,061) | (3,000) |  |
Total shareholders' equity of MBIA Inc. | 826 | 1,119 |  |
Total liabilities and equity | $ 7,284 | $ 8,107 |  |
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 | 283,433,401 | 283,625,689 |  |
Treasury stock, shares | 204,000,108 | 193,803,976 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $610 and $815) | $ 674 | $ 839 |  |
Investments carried at fair value | 1 | 7 |  |
Investments pledged as collateral, at fair value (amortized cost $19 and $49) | 11 | 46 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $167 and $83) | 167 | 83 |  |
Total investments | 853 | 975 |  |
Cash and cash equivalents | 11 | 40 | $ 10 | $ 13
Investment in wholly-owned subsidiaries | 1,456 | 1,876 |  |
Other assets | 123 | 130 |  |
Total assets | 2,443 | 3,021 |  |
Liabilities: |  |  |  |
Investment agreements | 274 | 276 |  |
Long-term debt | 427 | 577 |  |
Affiliate loans payable | 658 | 675 |  |
Income taxes payable | 60 | 138 |  |
Derivative liabilities | 133 | 157 |  |
Other liabilities | 65 | 79 |  |
Total liabilities | 1,617 | 1,902 |  |
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—283,433,401 and 283,625,689 | 283 | 284 |  |
Additional paid-in capital | 2,999 | 3,025 |  |
Retained earnings | 607 | 966 |  |
Accumulated other comprehensive income (loss), net of tax | (2) | (156) |  |
Treasury stock, at cost—203,157,759 and 193,803,976 shares | (3,061) | (3,000) |  |
Total shareholders' equity of MBIA Inc. | 826 | 1,119 |  |
Total liabilities and equity | 2,443 | 3,021 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 610 | 815 |  |
Investments pledged as collateral, amortized cost | 19 | 49 |  |
Short-term investments, amortized cost | $ 167 | $ 83 |  |
Preferred stock, par value | $ 1 | $ 1 |  |
Preferred stock, authorized shares | 10,000,000 | 10,000,000 |  |
Common stock, par value | $ 1 | $ 1 |  |
Common stock, authorized shares | 400,000,000 | 400,000,000 |  |
Common stock, issued shares | 283,433,401 | 283,625,689 |  |
Treasury stock, shares | 204,000,108 | 193,803,976 |  |

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