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Commitments and Contingencies - Additional Information (Details) $ in Millions	6 Months Ended
	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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Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Retiree Committee Asserted Pension Liabilities

+ References

No definition available.

+ Details

Name:	ambc_RetireeCommitteeAssertedPensionLiabilities
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