XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.22.2

Outstanding Exposure - Schedule of Non-Financial Guaranty Exposure (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Insured Financial Obligations [Line Items] |  |
Gross Exposure | $ 1,625 | $ 1,605
Net Exposure | 1,119 | 1,071
Life insurance transactions |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Gross Exposure | 1,270 | 1,250
Net Exposure | 919 | 871
Life insurance transactions | Maximum |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Net Exposure | 1,100 |
Aircraft residual value insurance policies |  |
Schedule of Insured Financial Obligations [Line Items] |  |
Gross Exposure | 355 | 355
Net Exposure | $ 200 | $ 200

X
- Definition [Line Items] for Schedule of Insured Financial Obligations [Table] + References No definition available. + Details
Name: | ago_ScheduleofInsuredFinancialObligationsLineItems
Namespace Prefix: | ago_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Specialty Insurance and Reinsurance, Gross Par + References No definition available. + Details
Name: | ago_SpecialtyInsuranceandReinsuranceGrossPar
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Specialty Insurance and Reinsurance, Net Par + References No definition available. + Details
Name: | ago_SpecialtyInsuranceandReinsuranceNetPar
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=sic_Z3721
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |