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Basis of Presentation and Significant Accounting Policies Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 31, 2020
Schedule of Cash Flow Supplemental Information [Line Items] |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
Supplemental Disclosure of Cash Flow Information |  | Three Months Ended March 31,
|  | 2020 |  | 2019
Cash paid during the period for: |  |  |  |
Income taxes |  | $ | 2 |  |  | $ | 1 |
Interest on long-term debt |  | 31 |  |  | 38 |
Non-cash financing activities: |  |  |  |
Exchange of investments in Puerto Rico COFINA bonds for new bonds issued in the Plan of Adjustment |  | $ | — |  |  | $ | 510 |
|  | March 31,
|  | 2020 |  | 2019
Reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets to the Consolidated Statements of Cash Flows: |  |  |  |
Cash and cash equivalents |  | $ | 58 |  |  | $ | 22 |
Restricted cash |  | 31 |  |  | — |
Variable Interest Entity Restricted cash |  | 2 |  |  | 3 |
Total cash, cash equivalents, and restricted cash shown on the Consolidated Statements of Cash Flows |  | $ | 91 |  |  | $ | 25 |

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- Definition [Line Items] for Schedule of Cash Flow Supplemental Information [Table] + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
Name: | us-gaap_ScheduleOfCashFlowSupplementalDisclosuresTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration