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Schedule II (Condensed Balance Sheets) (Detail) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Assets [Abstract] |  |  |  |
Cash and cash equivalents | $ 146 | $ 187 | $ 522 | $ 782
Total assets | 9,095 | 11,137 | 14,836 |
Liabilities: |  |  |  |
Long-term debt | 2,121 | 1,986 |  |
Total liabilities | 7,670 | 7,898 |  |
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-- 283,717,973 and 283,989,999 | 284 | 284 |  |
Additional paid-in capital | 3,171 | 3,160 |  |
Retained earnings | 1,095 | 2,700 |  |
Accumulated other comprehensive income (loss), net of tax | (19) | (128) | (61) | 21
Treasury stock, at cost-- 192,233,526 and 148,789,168 shares | (3,118) | (2,789) |  |
Total shareholders' equity of MBIA Inc. | 1,413 | 3,227 |  |
Total liabilities and equity | 9,095 | 11,137 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | $ 4,438 | $ 5,450 |  |
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 | 283,717,973 | 283,989,999 |  |
Treasury stock, shares | 192,233,526 | 148,789,168 |  |
Parent Company [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $590 and $687) | $ 639 | $ 725 |  |
Investments carried at fair value | 8 | 6 |  |
Investments pledged as collateral, at fair value (amortized cost $155 and $242) | 148 | 233 |  |
Short-term investments held as available-for-sale, at fair value (amortized cost $283 and $278) | 283 | 278 |  |
Other investments | 1 | 2 |  |
Total investments | 1,079 | 1,244 |  |
Cash and cash equivalents | 10 | 13 | $ 35 | $ 100
Investment in wholly-owned subsidiaries | 2,290 | 3,673 |  |
Deferred income taxes, net | 0 | 1,003 |  |
Other assets | 144 | 107 |  |
Total assets | 3,523 | 6,040 |  |
Liabilities: |  |  |  |
Investment agreements | 301 | 361 |  |
Long-term debt | 576 | 576 |  |
Affiliate loans payable | 772 | 901 |  |
Income taxes payable | 237 | 696 |  |
Other liabilities | 224 | 279 |  |
Total liabilities | 2,110 | 2,813 |  |
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-- 283,717,973 and 283,989,999 | 284 | 284 |  |
Additional paid-in capital | 3,171 | 3,160 |  |
Retained earnings | 1,095 | 2,700 |  |
Accumulated other comprehensive income (loss), net of tax | (19) | (128) |  |
Treasury stock, at cost-- 192,233,526 and 148,789,168 shares | (3,118) | (2,789) |  |
Total shareholders' equity of MBIA Inc. | 1,413 | 3,227 |  |
Total liabilities and equity | 3,523 | 6,040 |  |
Fixed-maturity securities held as available-for-sale, amortized cost | 590 | 687 |  |
Investments pledged as collateral, amortized cost | 155 | 242 |  |
Short-term investments held as available-for-sale, amortized cost | $ 283 | $ 278 |  |
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 | 283,717,973 | 283,989,999 |  |
Treasury stock, shares | 192,233,526 | 148,789,168 |  |

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