XML 77 R54.htm IDEA: XBRL DOCUMENT
v3.22.4

Background and Business Description - Settlement of RMBS Litigation - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) Related to Litigation Settlement |  |  | $ 126 | $ 0
Loss Reserves [Member] |  |  |  |
Gain (Loss) Related to Litigation Settlement | $ 43 | $ 319 | 362 |
Litigation Recoveries |  |  |  |
Gain (Loss) Related to Litigation Settlement | 126 |  | 126 |
Gain (loss) on extinguishment of debt |  |  |  |
Gain (Loss) Related to Litigation Settlement | (53) |  | (53) |
Gain (Loss) on Investments [Member] |  |  |  |
Gain (Loss) Related to Litigation Settlement | 5 |  | 5 |
R&W value |  |  |  |
Loss and Loss Benjefit Relating to R&W Recoveries |  |  | 123 |
Bank of America |  |  |  |
Proceeds from Legal Settlements |  |  | 1,840 |
Gain (Loss) Related to Litigation Settlement | $ 121 | $ 319 | 440 |
Nomura Credit & Capital, Inc. |  |  |  |
Proceeds from Legal Settlements |  |  | $ 140 |

X
- Definition Loss and Loss Benjefit Relating to R&W Recoveries + References No definition available. + Details
Name: | ambc_LossAndLossBenjefitRelatingToRWRecoveries
Namespace Prefix: | ambc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
Name: | us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ambc_LossReservesClaimLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ambc_LitigationRecoveriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ambc_GainLossOnExtinguishmentOfDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GainLossOnInvestmentsMember1
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=ambc_RWValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=ambc_BankOfAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_LitigationCaseAxis=ambc_NomuraCreditCapitalIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |