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Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal | $ 2,331 | $ 2,229 |
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 |  |
MBIA Inc. Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 5.70% |  |
Long-term debt, maturity year | 2034 |  |
Debt instrument principal amount repurchased | $ 10 |  |
Debt instrument amount payable on repurchase | $ 10 |  |
MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Callable date for fifth anniversary of initial callable date | Jan. 15, 2023 |  |
Mbia Inc Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 7.00% |  |
Long-term debt, maturity year | 2025 |  |
Debt instrument principal amount repurchased | $ 13 |  |
6.400% Senior Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of debt redemption |  | 100.00% |
Debt instrument interest rate | 6.40% | 6.40% |
Long-term debt, maturity year | 2022 |  |
Long-term debt principal amount previously purchased |  | $ 115 |
Debt instrument principal amount repurchased | $ 115 |  |
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 | $ 136 | 141 |
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 | $ 99 | $ 100 |
Medium-term notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 3.62% | 2.97% |
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 | 5.89% | 5.86% |
Refinanced Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of senior notes |  |  | $ 54
Debt instrument interest rate | 7.00% |  |
Long-term debt, maturity date | Apr. 20, 2022 |  |
Aggregate unpaid contractual principal | $ 68 |  |
Maximum [Member] | Medium-term notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 5.90% | 6.00% |
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 | 0.00% | 0.00% |
Minimum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 4.78% | 4.78% |
MBIA Corp Financing Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 12.00% |  |
Long-term debt, maturity date | Jan. 20, 2022 |  |
MBIA Corp Financing Facility [Member] | Initial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  |  | $ 278
MBIA Corp Financing Facility [Member] | Outstanding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal |  | $ 273 |
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] |  |  |
Long-term debt principal amount previously purchased | 308 |  |
Debt instrument principal amount repurchased | 10 |  |
Mbia Corp [Member] | 6.625% Debentures Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument principal amount repurchased | 5 |  |
Mbia Corp [Member] | 7.150% Debentures Due 2027 [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 | 922 | 1,400 |
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate unpaid contractual principal | $ 350 | $ 722 |

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