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Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Aggregate unpaid contractual principal | $ 2,585 | $ 2,428
Debt instrument principal amount repurchased | $ 308 |
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 |
Repayments of Debt |  | 7
Litigation Trust [Member] | Unfunded Loan Commitment [Member] |  |
Debt Instrument [Line Items] |  |
Other Commitment | $ 9 |
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 |
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 | 112
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 | $ 96 | 96
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 | $ 3 | 2
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 | $ 45
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 |
Medium-term notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 4.76% | 4.65%
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 | 6.06% | 6.09%
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% | 6.88%
Minimum [Member] | Medium-term notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 2.21% | 2.06%
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 |
National [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 10 |
Long-term debt principal amount previously purchased | 308 |
National [Member] | MBIA Inc. Senior Notes [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 10 |
Mbia Corp [Member] |  |
Debt Instrument [Line Items] |  |
Other Commitment | 6 |
Mbia Corp [Member] | 6.625% Debentures Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased |  | $ 24
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 |
Mbia Corp [Member] | 7.150% Debentures Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased |  | 4
Mbia Corp [Member] | 7.150% Debentures Due 2027 [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 5 |
Mbia Corp [Member] | 7.000% Debentures Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased |  | 1
Mbia Corp [Member] | 7.000% Debentures Due 2025 [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 1 |
Variable Interest Entity Primary Beneficiary [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate unpaid contractual principal | 328 | 780
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate unpaid contractual principal | $ 96 | $ 189

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