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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 07, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt principal amount purchased |  | $ 308 |  |
Securities posted as collateral to derivative counterparties |  |  | $ 73 |
Dividend declared per common share | $ 8 |  |  |
Dividend payment date |  | Dec. 22, 2023 |  |
Mbia Inc. Debentures [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt, interest rate |  | 7.00% |  |
Long-term debt, maturity year |  | 2025 |  |
MBIA Inc. Senior Notes [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt, interest rate |  | 5.70% |  |
Long-term debt, maturity year |  | 2034 |  |
6.625% Senior Notes due 2028 [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 29 | $ 24 |
Long-term debt, interest rate |  | 6.625% | 6.625% |
Long-term debt, maturity year |  | 2028 | 2028 |
7.15% Senior Notes due 2027 [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 5 | $ 4 |
Long-term debt, interest rate |  | 7.15% | 7.15% |
Long-term debt, maturity year |  | 2027 | 2027 |
7.00% Senior Notes due 2025 [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 1 | $ 1 |
Long-term debt, interest rate |  | 7.00% | 7.00% |
Long-term debt, maturity year |  | 2025 | 2025 |
MBIA Corp Surplus Notes [Member] | Mbia Inc. Debentures [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt principal amount purchased |  | $ 13 |  |
MBIA Inc. [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Liquid assets |  | 411 |  |
Fair value of securities pledged as collateral |  | $ 241 | $ 251 |
Securities posted as collateral to derivative counterparties |  |  | 73 |
Dividend declared per common share | $ 8 |  |  |
Dividend payment date |  | Dec. 22, 2023 |  |
National [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Dividends from subsidiaries |  |  | $ 72 | $ 60
National [Member] | Special Dividend [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Dividends from subsidiaries |  | $ 550 |  |
National [Member] | Right Dividend [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Dividends from subsidiaries |  | 97 |  |
National [Member] | Mbia Inc. Debentures [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt principal amount purchased |  | 10 |  |
National [Member] | MBIA Inc. Senior Notes [Member] | Mbia Inc. Debentures [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Long-term debt principal amount purchased |  | $ 10 |  |

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