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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Long-term debt principal amount purchased | $ 308 |  |
Fair value of securities pledged as collateral | 280 | $ 282 |
Securities posted as collateral to derivative counterparties | $ 159 | $ 214 |
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 principal amount purchased | $ 13 |  |
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 | $ 115 |  |
Long-term debt principal amount purchased, par value | 100.00% |  |
Long-term debt, interest rate | 6.40% | 6.40% |
Long-term debt, maturity year | 2022 |  |
6.625% Senior Notes due 2028 [Member] |  |  |
Long-term debt, interest rate | 6.625% |  |
Long-term debt, maturity year | 2028 |  |
Debt Instrument, Face Amount | $ 5 |  |
7.15% Senior Notes due 2027 [Member] |  |  |
Long-term debt, interest rate | 7.15% |  |
Long-term debt, maturity year | 2027 |  |
Debt Instrument, Face Amount | $ 1 |  |
MBIA Inc. [Member] |  |  |
Liquid assets | 239 |  |
Fair value of securities pledged as collateral | 280 | $ 282 |
Securities posted as collateral to derivative counterparties | 159 | 214 |
National [Member] |  |  |
Dividends from subsidiaries | 60 | $ 81 | $ 134
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | $ 10 |  |

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