2101100 - Disclosure - Background and Business Description link:presentationLink link:calculationLink link:definitionLink 2401402 - Disclosure - Background and Business Description - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2301301 - Disclosure - Background and Business Description Reorganization Costs (Tables) link:presentationLink link:calculationLink link:definitionLink 2402406 - Disclosure - Basis of Presentation and Significant Accounting Policies Change in Accounting (Details) link:presentationLink link:calculationLink link:definitionLink 2402403 - Disclosure - Basis of Presentation and Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 2402404 - Disclosure - Basis of Presentation and Significant Accounting Policies FX gain (loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2402405 - Disclosure - Basis of Presentation and Significant Accounting Policies Goodwill (Details) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - Basis of Presentation and Significant Accounting Policies (Notes) link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - Basis of Presentation and Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 2302302 - Disclosure - Basis of Presentation and Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 2118100 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 2418402 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2318301 - Disclosure - Commitments and Contingencies Estimate of Future Net Minimum Lease Payments (Tables) link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 2405403 - Disclosure - Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Comprehensive Income (Tables) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1001501 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Consolidated Statements of Total Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Consolidated Statements of Total Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1002501 - Statement - Consolidated Statements of Total Comprehensive Income (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Derivative Instruments link:presentationLink link:calculationLink link:definitionLink 2412403 - Disclosure - Derivative Instruments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - Derivative Instruments - Summarize Information by Major Category of CDS Contracts (Detail) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 2412405 - Disclosure - Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) link:presentationLink link:calculationLink link:definitionLink 2412404 - Disclosure - Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) link:presentationLink link:calculationLink link:definitionLink 2412407 - Disclosure - Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Detail) link:presentationLink link:calculationLink link:definitionLink 2412408 - Disclosure - Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Detail) link:presentationLink link:calculationLink link:definitionLink 2312301 - Disclosure - Derivative Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Fair Value Measurements - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) link:presentationLink link:calculationLink link:definitionLink 2410407 - Disclosure - Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) link:presentationLink link:calculationLink link:definitionLink 2410408 - Disclosure - Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) link:presentationLink link:calculationLink link:definitionLink 2410409 - Disclosure - Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Detail) link:presentationLink link:calculationLink link:definitionLink 2410405 - Disclosure - Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Detail) link:presentationLink link:calculationLink link:definitionLink 2410406 - Disclosure - Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Phantom) (Detail) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Financial Guarantee Insurance Contracts link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Financial Guarantee Insurance Contracts - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2409404 - Disclosure - Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) link:presentationLink link:calculationLink link:definitionLink 2409413 - Disclosure - Financial Guarantee Insurance Contracts - Estimated Future Amortization Expense for Insurance Intangible Asset (Detail) link:presentationLink link:calculationLink link:definitionLink 2409406 - Disclosure - Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) link:presentationLink link:calculationLink link:definitionLink 2409412 - Disclosure - Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) link:presentationLink link:calculationLink link:definitionLink 2409405 - Disclosure - Financial Guarantee Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Detail) link:presentationLink link:calculationLink link:definitionLink 2409410 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Detail) link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Detail) link:presentationLink link:calculationLink link:definitionLink 2409408 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail) link:presentationLink link:calculationLink link:definitionLink 2409409 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Phantom) (Detail) link:presentationLink link:calculationLink link:definitionLink 2409407 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Detail) link:presentationLink link:calculationLink link:definitionLink 2409411 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Detail) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Financial Guarantee Insurance Contracts (Tables) link:presentationLink link:calculationLink link:definitionLink 2409414 - Disclosure - Financial Guarantee Insurance - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Detail) link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2416403 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2416406 - Disclosure - Income Taxes Income Taxes - NOL Usage Table (Details) link:presentationLink link:calculationLink link:definitionLink 2416405 - Disclosure - Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) link:presentationLink link:calculationLink link:definitionLink 2416402 - Disclosure - Income Taxes - Major Jurisdictions (Detail) link:presentationLink link:calculationLink link:definitionLink 2416404 - Disclosure - Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Detail) link:presentationLink link:calculationLink link:definitionLink 2316301 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - Investments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2411402 - Disclosure - Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) link:presentationLink link:calculationLink link:definitionLink 2411403 - Disclosure - Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity (Detail) link:presentationLink link:calculationLink link:definitionLink 2411406 - Disclosure - Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) link:presentationLink link:calculationLink link:definitionLink 2411409 - Disclosure - Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Detail) link:presentationLink link:calculationLink link:definitionLink 2411410 - Disclosure - Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Phantom) (Detail) link:presentationLink link:calculationLink link:definitionLink 2411404 - Disclosure - Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Detail) link:presentationLink link:calculationLink link:definitionLink 2411411 - Disclosure - Investments - Summary of Net Investment Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2411407 - Disclosure - Investments - Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2411408 - Disclosure - Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Detail) link:presentationLink link:calculationLink link:definitionLink 2311301 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Net Income Per Share link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Net Income Per Share - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2406403 - Disclosure - Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Net Income Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2119100 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 2419402 - Disclosure - Segment Information - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2419404 - Disclosure - Segment Information - Schedule of Gross Premiums Written, Net Premiums Earned and Net Change in Fair Value of Credit Derivatives (Detail) link:presentationLink link:calculationLink link:definitionLink 2419403 - Disclosure - Segment Information - Summary of Financial Information by Reportable Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 2319301 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2104100 - Disclosure - Special Purpose Entities, Including Variable Interest Entities link:presentationLink link:calculationLink link:definitionLink 2404402 - Disclosure - Special Purpose Entities, Including Variable Interest Entities - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2404405 - Disclosure - Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Detail) link:presentationLink link:calculationLink link:definitionLink 2404403 - Disclosure - Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) link:presentationLink link:calculationLink link:definitionLink 2404404 - Disclosure - Special Purpose Entities, Including Variable Interest Entities - Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities (Detail) link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Special Purpose Entities, Including Variable Interest Entities (Tables) link:presentationLink link:calculationLink link:definitionLink