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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Insurance [Abstract]
Loss Reserves Ceded To Reinsurers	$ 29	$ 33	$ 36	$ 26
Ceded Loss And Loss Expenses Paid Not Yet Recovered	$ 1	$ 1	$ 1

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- Definition

Ceded Loss And Loss Expenses Paid Not Yet Recovered

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No definition available.

+ Details

Name:	ambc_CededLossAndLossExpensesPaidNotYetRecovered
Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims expected to be paid or incurred by the ceding insurer.

+ References

No definition available.

+ Details

Name:	ambc_LossReservesCededToReinsurers
Namespace Prefix:	ambc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration