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Schedule II - (Notes to Condensed Financial Statements) (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt principal amount purchased | $ 308 |  |
Dividend declared per common share |  | $ 8 |
O 2023 Q4 Dividends [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
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 |  |
Long-term debt, interest rate | 6.625% |  |
Long-term debt, maturity year | 2028 |  |
7.150% Senior Notes due 2027 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt, interest rate | 7.15% |  |
Long-term debt, maturity year | 2027 |  |
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 | 380 |  |
Fair value of securities pledged as collateral | $ 213 | $ 241 |
Dividend declared per common share |  | $ 8 |
MBIA Inc. [Member] | O 2023 Q4 Dividends [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividend payment date | Dec. 22, 2023 |  |
National [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from subsidiaries | $ 69 |  | $ 72
National [Member] | S 2023 A Dividends [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from subsidiaries |  | $ 550 |
National [Member] | O 2023 A Right Dividends [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from subsidiaries |  | $ 97 |
National [Member] | 7.00% Senior Notes due 2025 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt principal amount purchased | 10 |  |
MBIA Corp [Member] | 7.150% Senior Notes due 2027 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt principal amount purchased | 5 |  |
MBIA Corp [Member] | 7.00% Senior Notes due 2025 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Long-term debt principal amount purchased | $ 1 |  |

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