XML 103 R83.htm IDEA: XBRL DOCUMENT
v3.23.1

Financial Guaranty Variable Interest Entities and Consolidated Investment Vehicles - Unpaid Principal (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financial Guaranty Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
FG VIEs’ liabilities with recourse | $ 23 | $ 21
FG VIEs’ liabilities without recourse | 16 | 15
Unpaid principal for FG VIEs’ liabilities with recourse | 715 | 723
Financial Guaranty Variable Interest Entities |  |
Variable Interest Entity [Line Items] |  |
FG VIEs’ assets | 264 | 265
Unpaid principal balance for FG VIEs’ assets that were 90 days or more past due | $ 32 | $ 34

X
- Definition Fair Value, Option, Liabilities with Recourse, Unpaid Principal Balance + References No definition available. + Details
Name: | ago_FairValueOptionLiabilitieswithRecourseUnpaidPrincipalBalance
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair Value, Option, Loans Held as Liabilities, Aggregate Difference, With Recourse + References No definition available. + Details
Name: | ago_FairValueOptionLoansHeldasLiabilitiesAggregateDifferenceWithRecourse
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair Value, Option, Loans Held as Liabilities, Aggregate Difference, Without Recourse + References No definition available. + Details
Name: | ago_FairValueOptionLoansHeldasLiabilitiesAggregateDifferenceWithoutRecourse
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
Name: | us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI https://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 + Details
Name: | us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByLiabilityClassAxis=ago_FinancialGuarantyVariableInterestEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=ago_FinancialGuarantyVariableInterestEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |