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v3.25.0.1

Debt (Narrative) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  | $ 2,741,000,000 | $ 2,585,000,000
Debt instrument principal amount repurchased |  | $ 308,000,000 |
Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 7.00% |
Long-term debt, maturity year |  | 2025 |
Litigation Trust [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 18.00% |
Long-term debt, maturity date |  | Aug. 02, 2027 |
Unused Commitment |  | $ 0 |
MBIA Inc. Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 5.70% |
Long-term debt, maturity year |  | 2034 |
MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Callable date for fifth anniversary of initial callable date |  | Jan. 15, 2028 |
MBIA Corp Surplus Notes [Member] | Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument principal amount repurchased |  | $ 13,000,000 |
6.625% Debentures Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 6.625% |
Long-term debt, maturity year |  | 2028 |
Aggregate unpaid contractual principal |  | $ 112,000,000 | $ 112,000,000
6.625% Debentures Due 2028 [Member] | Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  |  | 6.625%
Long-term debt, maturity year |  |  | 2028
7.150% Debentures Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 7.15% |
Long-term debt, maturity year |  | 2027 |
Aggregate unpaid contractual principal |  | $ 95,000,000 | $ 96,000,000
7.150% Debentures Due 2027 [Member] | Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 7.15% |
Long-term debt, maturity year |  | 2027 |
Third Party Loan [Member] | Litigation Trust [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  | $ 12,000,000 | 3,000,000
7.000% Debentures Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 7.00% |
Long-term debt, maturity year |  | 2025 |
Aggregate unpaid contractual principal |  | $ 45,000,000 | 45,000,000
7.000% Debentures Due 2025 [Member] | Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 7.00% |
Long-term debt, maturity year |  | 2025 |
5.700% Senior Notes Due 2034 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 5.70% |
Long-term debt, maturity year |  | 2034 |
Aggregate unpaid contractual principal | [1] | $ 21,000,000 | $ 21,000,000
Medium-term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 5.17% | 4.76%
Medium-term Notes [Member] | Floating Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 0.00% |
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 6.01% | 6.06%
Maximum [Member] | Medium-term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 5.90% | 5.90%
Maximum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  |  | 6.88%
Minimum [Member] | Medium-term Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 2.50% | 2.21%
Minimum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 4.78% | 4.78%
MBIA Inc. [Member] | MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased |  |  | $ 13,000,000
National [Member] | 7.000% Debentures Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument principal amount repurchased |  | $ 10,000,000 |
National [Member] | 5.700% Senior Notes Due 2034 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased |  | 308,000,000 |
Mbia Corp [Member] | 6.625% Debentures Due 2028 [Member] | Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased |  |  | 29,000,000
Mbia Corp [Member] | 7.150% Debentures Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument principal amount repurchased |  | 5,000,000 |
Mbia Corp [Member] | 7.000% Debentures Due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument principal amount repurchased |  | 1,000,000 |
Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  | 45,000,000 | 328,000,000
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  | $ 36,000,000 | $ 96,000,000
[1] | Callable anytime at the greater of par or the present value of the remaining scheduled payments of principal and interest.

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