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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair value of securities pledged as collateral | $ 314 | $ 353 |
Securities posted as collateral to derivative counterparties | $ 205 | 237 |
MBIA Inc. Senior Notes [Member] |  |  |
Long-term debt, interest rate | 5.70% |  |
Long-term debt, maturity year | 2034 |  |
Mbia Inc. Debentures [Member] |  |  |
Long-term debt, interest rate | 7.00% |  |
Long-term debt, maturity year | 2025 |  |
National Public Finance Guarantee Holdings, Inc. [Member] |  |  |
Dividends from subsidiaries | $ 1 | 118 | $ 118
MBIA Inc. [Member] |  |  |
Liquid assets | 457 |  |
Fair value of securities pledged as collateral | 314 | 350 |
Securities posted as collateral to derivative counterparties | 205 | 237 |
National [Member] |  |  |
Dividends from subsidiaries | 108 | 118 |
National [Member] | MBIA Inc. Senior Notes [Member] |  |  |
Long-term debt principal amount purchased | 44 | $ 129 |
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | 10 |  |
MBIA Capital Corp. [Member] |  |  |
Dividends from subsidiaries | $ 3 |  |

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