XML 19 R6.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Statement of Comprehensive Income [Abstract] |  |  |  |
Investments with no credit impairment, tax | $ (4) | $ (6) | $ (9) | $ 8
Investments with credit impairment, tax | $ 1 | $ (3) | $ 1 | $ (2)

X
- Definition Other Comprehensive Income (Loss), Available-for-sale Securities, With Credit Impairment, Tax + References No definition available. + Details
Name: | ago_OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other Comprehensive Income (Loss), Available-for-sale Securities, Without Credit Impairment, Tax + References No definition available. + Details
Name: | ago_OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration