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Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 18.00% |
Long-term debt, maturity date | Aug. 02, 2027 |
Aggregate unpaid contractual principal | $ 2,428 | $ 2,331
Debt instrument principal amount repurchased | 308 |
Repayments of Debt | 7 |
Unfunded Loan Commitment [Member] |  |
Debt Instrument [Line Items] |  |
Other Commitment | $ 8 |
Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 7.00% |
Long-term debt, maturity year | 2025 |
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 | 136
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 | 99
Third Party Loan [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate unpaid contractual principal | $ 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 | $ 46
Medium-term notes [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 4.65% | 3.62%
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 | 6.09% | 5.89%
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 | 2.06% | 0.00%
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 |
National [Member] | MBIA Inc. Senior Notes [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 10 |
Debt instrument amount payable on repurchase | 10 |
National [Member] | Mbia Inc Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount previously purchased | 308 |
Mbia Corp [Member] | 6.625% Debentures Due 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 24 | $ 5
Mbia Corp [Member] | 7.150% Debentures Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument principal amount repurchased | 4 | 1
Mbia Corp [Member] | 7.000% Debentures Due 2025 [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 | 780 | 922
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |
Debt Instrument [Line Items] |  |
Aggregate unpaid contractual principal | $ 189 | $ 350

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