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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Long-term debt principal amount purchased |  | $ 44 |
Fair value of securities pledged as collateral | $ 313 | 314 |
Securities posted as collateral to derivative counterparties | $ 181 | 205 |
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 |  |
6.400% Senior Notes due 2022 [Member] |  |  |
Long-term debt principal amount purchased | $ 150 |  |
Long-term debt principal amount purchased, par value | 100.00% |  |
Long-term debt, interest rate | 6.40% |  |
Long-term debt, maturity year | 2022 |  |
National Public Finance Guarantee Holdings, Inc. [Member] |  |  |
Dividends from subsidiaries |  | 1 | $ 118
MBIA Inc. [Member] |  |  |
Liquid assets | $ 375 |  |
Fair value of securities pledged as collateral | 313 | 314 |
Securities posted as collateral to derivative counterparties | 181 | 205 |
National [Member] |  |  |
Dividends from subsidiaries | 134 | 108 |
National [Member] | MBIA Inc. Senior Notes [Member] |  |  |
Long-term debt principal amount purchased | 44 |  |
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | 10 | $ 10 |
MBIA Capital Corp. [Member] |  |  |
Dividends from subsidiaries | $ 3 |  |

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