Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2025
Text Block [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and, accordingly, do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for annual periods. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2024. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for the fair statement of the Company’s consolidated financial position and results of operations. All material intercompany balances and transactions have been eliminated. Certain amounts have been reclassified in prior years' financial statements to conform to the current presentation. The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results. The results of operations for the three and six months ended June 30, 2025 may not be indicative of the results that may be expected for the year ending December 31, 2025. The December 31, 2024 consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by GAAP for annual periods.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards The Company has not adopted any new accounting pronouncements that had a material impact on its consolidated financial statements. MBIA Inc. and Subsidiaries Notes to Consolidated Financial Statements (Unaudited) Note 3: Recent Accounting Pronouncements (continued) Recent Accounting Developments Income Taxes (Topic 740): Improvements to Income Tax Disclosure (ASU 2023-09) In December of 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures” which requires disaggregated information about a reporting entity’s effective tax rate reconciliation, information on income taxes paid, and contain other disclosure requirements. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted. Upon the effective date, the amendments should be applied prospectively with retrospective application permitted. The Company is currently evaluating the potential impact of adopting ASU 2023-09. Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03) In November of 2024, the FASB issued ASU 2024-03, “Disaggregation of Income Statement Expenses" which requires to disclose the amounts of employee compensation, depreciation, intangible asset amortization, and certain other costs and expenses included in each relevant expense caption on the consolidated statements of operations and include certain amounts that are already required to be disclosed under current GAAP in the same disclosure. Additionally, ASU 2024-03 requires the disclosure of a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively and the disclosure of the total amount of selling expenses. This ASU is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. Upon the effective date, the amendments can be applied either prospectively or retrospectively. The Company is currently evaluating the potential impact of adopting ASU 2024-03.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2025

The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X and, accordingly, do not include all of the information and disclosures required by accounting principles generally accepted in the United States of America (“GAAP”) for annual periods. These statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Annual Report on Form 10-K for the year ended December 31, 2024. The accompanying consolidated financial statements have not been audited by an independent registered public accounting firm in accordance with the standards of the Public Company Accounting Oversight Board (U.S.), but in the opinion of management such financial statements include all adjustments, consisting only of normal recurring adjustments, necessary for the fair statement of the Company’s consolidated financial position and results of operations. All material intercompany balances and transactions have been eliminated. Certain amounts have been reclassified in prior years' financial statements to conform to the current presentation.

The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. As additional information becomes available or actual amounts become determinable, the recorded estimates are revised and reflected in operating results.

The results of operations for the three and six months ended June 30, 2025 may not be indicative of the results that may be expected for the year ending December 31, 2025. The December 31, 2024 consolidated balance sheet was derived from audited financial statements, but does not include all disclosures required by GAAP for annual periods.

Recently Adopted Accounting Standards

The Company has not adopted any new accounting pronouncements that had a material impact on its consolidated financial statements.

MBIA Inc. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited)

Note 3: Recent Accounting Pronouncements (continued)

Recent Accounting Developments

Income Taxes (Topic 740): Improvements to Income Tax Disclosure (ASU 2023-09)

In December of 2023, the FASB issued ASU 2023-09, “Improvements to Income Tax Disclosures” which requires disaggregated information about a reporting entity’s effective tax rate reconciliation, information on income taxes paid, and contain other disclosure requirements. This ASU is effective for annual periods beginning after December 15, 2024, with early adoption permitted. Upon the effective date, the amendments should be applied prospectively with retrospective application permitted. The Company is currently evaluating the potential impact of adopting ASU 2023-09.

Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03)

In November of 2024, the FASB issued ASU 2024-03, “Disaggregation of Income Statement Expenses" which requires to disclose the amounts of employee compensation, depreciation, intangible asset amortization, and certain other costs and expenses included in each relevant expense caption on the consolidated statements of operations and include certain amounts that are already required to be disclosed under current GAAP in the same disclosure. Additionally, ASU 2024-03 requires the disclosure of a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively and the disclosure of the total amount of selling expenses. This ASU is effective for annual periods beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. Upon the effective date, the amendments can be applied either prospectively or retrospectively. The Company is currently evaluating the potential impact of adopting ASU 2024-03.