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Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Net gains (losses) on extinguishment of debt |  | $ (1) | $ 3
long-term debt principal amount issued | $ 2,229 | 2,228 |
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, 2023 |  |
Mbia Inc. Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 7.00% |  |
Long-term debt, maturity year | 2025 |  |
6.400% Senior Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of debt redemption | 100.00% |  |
Debt instrument interest rate | 6.40% |  |
Long-term debt, maturity year | 2022 |  |
long-term debt principal amount issued | $ 0 | 115 |
Long-term debt principal amount previously purchased | $ 115 | $ 150 |
Medium-term notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 2.97% | 3.07% |
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate | 5.86% | 5.86% |
Refinanced Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of senior notes |  | $ 54 |
Debt issuance cost paid |  | 6 |
Refinanced Facility [Member] | Expenses Of Consolidated Variable Interest Entities [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance cost expensed |  | 3 |
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] |  |  |
long-term debt principal amount issued |  | 278 |
MBIA Corp Financing Facility [Member] | Outstanding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
long-term debt principal amount issued | $ 273 | $ 246 |
Mbia Inc [Member] | MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased | 13 |  |
National [Member] | MBIA Inc. Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased | 308 |  |
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount previously purchased | 10 |  |
Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 5.57% |
Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
long-term debt principal amount issued | 1,400 | $ 2,300 |
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
long-term debt principal amount issued | $ 722 | $ 1,600 |
Maximum [Member] | Medium-term notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 6.00% | 6.00% |
Maximum [Member] | Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate | 6.88% | 6.88% |
Maximum [Member] | Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 12.00% |
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% |
Minimum [Member] | Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument interest rate |  | 3.71% |

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