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Disclosure - Business and Basis of Presentation Noncontrolling Interests (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - Business and Basis of Presentation (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - Segment Reporting (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - 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 (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - Investments - Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - Investments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - 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 (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - Investments - Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - Investments - Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - 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Disclosure - Fair Value Measurements - Summary of Information about Described Model Inputs Used to Determine Fair Value of Each Class of Credit Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Details) link:presentationLink link:calculationLink link:definitionLink 9954511 - Disclosure - Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9954512 - Disclosure - Insurance Contracts - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954513 - Disclosure - Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Details) link:presentationLink link:calculationLink link:definitionLink 9954514 - Disclosure - Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Details) link:presentationLink link:calculationLink link:definitionLink 9954515 - Disclosure - Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Details) link:presentationLink link:calculationLink link:definitionLink 9954516 - Disclosure - Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) link:presentationLink link:calculationLink link:definitionLink 9954517 - Disclosure - Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) link:presentationLink link:calculationLink link:definitionLink 9954518 - Disclosure - Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Details) link:presentationLink link:calculationLink link:definitionLink 9954519 - Disclosure - Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Phantom) (Details) link:presentationLink link:calculationLink link:definitionLink 9954520 - Disclosure - Insurance Contracts - Summary of Balance of RMBS Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach (Details) link:presentationLink link:calculationLink link:definitionLink 9954521 - Disclosure - 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 9954522 - Disclosure - Insurance - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) link:presentationLink link:calculationLink link:definitionLink 9954523 - Disclosure - Insurance Contracts - Premium Earned (Details) link:presentationLink link:calculationLink link:definitionLink 9954524 - Disclosure - Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 9954525 - Disclosure - Derivative Instruments - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954526 - Disclosure - Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9954527 - Disclosure - Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9954528 - Disclosure - Derivative Instruments - Summary of Notional Amounts of AFS's Trading Derivative Products (Details) link:presentationLink link:calculationLink link:definitionLink 9954529 - Disclosure - Derivative Instruments - Summary of Notional for VIE Derivatives Outstanding (Details) link:presentationLink link:calculationLink link:definitionLink 9954530 - Disclosure - Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954531 - Disclosure - Special Purpose Entities, Including Variable Interest Entities - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954532 - 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 (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - 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 (Details) link:presentationLink link:calculationLink link:definitionLink 9954534 - 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 (Details) link:presentationLink link:calculationLink link:definitionLink 9954535 - Disclosure - Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954536 - Disclosure - Revenue Recognition and Deferred Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954537 - Disclosure - Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9954538 - Disclosure - Comprehensive Income - Schedule of Amounts Reclassed Out of Each Component of Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 9954539 - Disclosure - Net Income Per Share - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954540 - Disclosure - Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954541 - Disclosure - Net Income Per Share Schedule of Basic and Dilutive Securities for EPS (Details) link:presentationLink link:calculationLink link:definitionLink 9954542 - Disclosure - Income Taxes - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9954543 - Disclosure - Income Taxes - Significant Portions of Deferred Tax Liabilities and Deferred Tax Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954544 - Disclosure - Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9954545 - Disclosure - Income Taxes Income Taxes - NOL Usage Table (Details) link:presentationLink link:calculationLink link:definitionLink 9954546 - Disclosure - Income Taxes Schedule of Income Before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954547 - Disclosure - Compensation Related Costs, Postemployment Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 9954548 - Disclosure - Commitments and Contingencies - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink