XML 110 R90.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts Earned Premiums by Geographic Location (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 47 | $ 54 | $ 66 |
Premiums Receivable, Gross | 329 | 387 |  |
Liability for Claims and Claims Adjustment Expense | 1,570 | 1,759 | (482) | $ (107)
Subrogation recoverable | 2,092 | 2,156 |  |
Financial Guarantee |  |  |  |
Liability for Claims and Claims Adjustment Expense | 1,538 |  |  |
Subrogation recoverable | (2,092) |  |  |
Property and Casualty, Commercial Insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense | 32 |  |  |
Subrogation recoverable | 0 |  |  |
Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 159 | 185 |  |
Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 45 | 59 |  |
International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 125 | 144 |  |
Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 157 | 168 |  |
Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 2 | 17 |  |
Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 16 | 22 |  |
Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 16 |  |
Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 10 | 14 |  |
Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 7 |  |
Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 93 | 108 |  |
Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 28 | 31 |  |
Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 5 |  |
Surveillance Category One [Member] |  |  |  |
Premiums Receivable, Gross | 277 | 302 |  |
Surveillance Category One [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 151 | 157 |  |
Surveillance Category One [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 19 | 27 |  |
Surveillance Category One [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 107 | 118 |  |
Surveillance Category One [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 149 | 155 |  |
Surveillance Category One [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 2 | 2 |  |
Surveillance Category One [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 3 |  |
Surveillance Category One [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 3 |  |
Surveillance Category One [Member] | Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 10 | 14 |  |
Surveillance Category One [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 7 | 7 |  |
Surveillance Category One [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 74 | 82 |  |
Surveillance Category One [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 28 | 31 |  |
Surveillance Category One [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 5 |  |
IA [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 40 |  |
IA [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 27 |  |
IA [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 0 |  |
IA [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 8 | 13 |  |
IA [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 3 | 13 |  |
IA [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 15 |  |
IA [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 0 |  |
IA [Member] | Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 8 | 13 |  |
IA [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IA [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] |  |  |  |
Premiums Receivable, Gross | 6 | 3 |  |
II [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 0 |  |
II [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 3 |  |
II [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 5 | 0 |  |
II [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 1 | 1 |  |
II [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 2 |  |
II [Member] | Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
II [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] |  |  |  |
Premiums Receivable, Gross | 22 | 27 |  |
III [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 14 |  |
III [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 11 | 13 |  |
III [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 2 | 3 |  |
III [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 9 | 11 |  |
III [Member] | Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 11 | 13 |  |
III [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
III [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 15 |  |
IV [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 15 |  |
IV [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Housing Revenue [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other Public Finance Sectors [Member] | Public Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Mortgage-backed and Home Equity [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 12 | 15 |  |
IV [Member] | Student Loan [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Structured Insurance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other Structured Finance [Member] | Structured Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Sovereign/Sub-sovereign [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Investor-owned and Public Utilities [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
IV [Member] | Other International [Member] | International Finance [Member] |  |  |  |
Premiums Receivable, Gross | 0 | 0 |  |
Reportable Geographical Components [Member] | UNITED STATES |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 27 | 32 | 55 |
Reportable Geographical Components [Member] | UNITED KINGDOM |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | 14 | 24 | 17 |
Reportable Geographical Components [Member] | Other International [Member] |  |  |  |
Premiums Earned, Net, Financial Guarantee Insurance Contracts | $ 6 | $ (2) | $ (6) |

X
- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
Name: | us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of financial guarantee premiums earned. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6933001&loc=SL5747862-161289 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6816-158387 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 6: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 7: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
Name: | us-gaap_PremiumsEarnedNetFinancialGuaranteeInsuranceContracts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.5) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
Name: | us-gaap_PremiumsReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The estimated amount as of the balance sheet date to be received by an insurer from the sale of property (usually damaged) on which the insurer has paid a total claim to the insured and has obtained title to the property and the right of an insurer to pursue any course of recovery of damages, in its name or in the name of the policyholder, against a third party who is liable for costs relating to an insured event that have been paid by the insurer. Estimated salvage and subrogation is generally deducted from the liability for unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13783-158432 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6482241&loc=d3e13779-158432 + Details
Name: | us-gaap_SalvageAndSubrogationRecoveriesValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis=us-gaap_FinancialGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfMalpracticeInsuranceTypeAndTierIdentifierAxis=us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=ambc_PublicFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_StructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=ambc_InternationalFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_HousingRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_OtherPublicFinanceSectorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_MortgageBackedAndHomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_StudentLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_StructuredInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_OtherStructuredFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_SovereignAndSubSovereignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_InvestorOwnedAndPublicUtilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=ambc_OtherInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategoryAxis=ambc_SurveillanceCategoryOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategoryAxis=ambc_SurveillanceCategoryOneaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategoryAxis=ambc_SurveillanceCategoryTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategoryAxis=ambc_SurveillanceCategoryThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationBySurveillanceCategoryAxis=ambc_SurveillanceCategoryFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=srt_ReportableGeographicalComponentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ambc_OtherInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |