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Commitments and Contingencies - Additional Information (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Retiree Committee Asserted Pension Liabilities | $ 58,500
AAC Asserted Pension Liability Overstatement | $ 9,000

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- Definition AAC Asserted Pension Liability Overstatement + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Retiree Committee Asserted Pension Liabilities + References No definition available. + Details
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Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration