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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Long-term debt principal amount purchased | $ 308 |  |
Long-term debt, interest rate | 18.00% |  |
Securities posted as collateral to derivative counterparties | $ 73 | $ 159 |
Mbia Inc. Debentures [Member] |  |  |
Long-term debt, interest rate | 7.00% |  |
Long-term debt, maturity year | 2025 |  |
MBIA Inc. Senior Notes [Member] |  |  |
Long-term debt, interest rate | 5.70% |  |
Long-term debt, maturity year | 2034 |  |
6.625% Senior Notes due 2028 [Member] |  |  |
Long-term debt, interest rate | 6.625% | 6.625% |
Long-term debt, maturity year | 2028 | 2028 |
Debt Instrument, Face Amount | $ 24 | $ 5 |
7.15% Senior Notes due 2027 [Member] |  |  |
Long-term debt, interest rate | 7.15% | 7.15% |
Long-term debt, maturity year | 2027 | 2027 |
Debt Instrument, Face Amount | $ 4 | $ 1 |
Mbia Corp Surplus Notes [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | $ 13 |  |
7.00% Senior Notes due 2025 [Member] |  |  |
Long-term debt, interest rate | 7.00% |  |
Long-term debt, maturity year | 2025 |  |
Debt Instrument, Face Amount | $ 1 |  |
MBIA Inc. [Member] |  |  |
Liquid assets | 230 |  |
Securities posted as collateral to derivative counterparties | 73 | 159 |
Fair value of securities pledged as collateral | 251 | 280 |
National [Member] |  |  |
Dividends from subsidiaries | 72 | $ 60 | $ 81
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | 10 |  |
National [Member] | MBIA Inc. Senior Notes [Member] | Mbia Inc. Debentures [Member] |  |  |
Long-term debt principal amount purchased | $ 10 |  |

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