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v3.19.3.a.u2

Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Net gains (losses) on extinguishment of debt |  | $ (1) |
Long-term debt principal amount purchased |  |  | $ 44
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 purchased |  | $ 150 |
Long-term debt principal amount owned | [1] | $ 115 | $ 265
Medium-term notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 3.07% | 3.23%
Investment Agreement Obligations [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 5.86% | 5.83%
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 owned |  | $ 278 |
MBIA Corp Financing Facility [Member] | Outstanding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount owned |  | 246 | $ 373
Mbia Inc [Member] | MBIA Corp Surplus Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount owned |  | 13 |
National [Member] | MBIA Inc. Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount owned |  | 308 |
National [Member] | Mbia Inc. Debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount purchased |  | 10 | $ 10
Long-term debt principal amount owned |  | $ 10 |
Variable Interest Entity [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average interest rate |  | 5.57% | 6.91%
Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount owned |  | $ 2,300 | $ 2,600
MBIA Insured Variable Interest Entity Primary Beneficiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt principal amount owned |  | $ 1,600 | $ 1,800
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% | 14.00%
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% | 2.81%
[1] | Callable on or after August 15, 2006 at par.

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