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Contracts Accounted for as Insurance - Net Expected Loss to be Expensed Insurance Contracts (Details) $ in Millions | Mar. 31, 2024 USD ($)
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Insurance [Abstract] |
2024 (April 1 - June 30) | $ 4
2024 (July 1 - September 30) | 3
2024 (October 1 - December 31) | 3
Subtotal 2024 | 10
2025 | 12
2026 | 15
2027 | 16
2028 | 14
2029-2033 | 67
2034-2038 | 47
2039-2043 | 11
After 2043 | 11
Net expected loss to be expensed (present value) | 203
Future accretion | (18)
Total expected future loss and LAE | $ 185

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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed Beyond Nineteenth Fiscal Year from Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedBeyondNineteenthFiscalYearFromBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed During Fourth Quarter Following Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedDuringFourthQuarterFollowingBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Future Expected, Net Loss to be Expensed During Remainder of Fiscal Year Following Balance Sheet Date + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Future Expected, Net Loss to be Expensed During Second Quarter Following Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedDuringSecondQuarterFollowingBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed During Third Quarter Following Balance Sheet Date + References No definition available. + Details
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Namespace Prefix: | ago_
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Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Future Expected, Net Loss to be Expensed in First Full Fiscal Year + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed More than 14 and Within 19 Years from Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedMoreThan14AndWithin19YearsFromBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed More than 9 and Within 14 Years from Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedMoreThan9AndWithin14YearsFromBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts Future Expected Net Loss to be Expensed More than Four and Within 9 Years from Balance Sheet Date + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLossToBeExpensedMoreThanFourAndWithin9YearsFromBalanceSheetDate
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For financial guarantee insurance contracts, the amount of net loss expected to be expensed within the fourth full fiscal year following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFourthFullFiscalYear
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For financial guaranty insurance contracts, the amount of net loss expected to be expensed within the second full fiscal year following the date of the latest balance sheet presented in the financial statements. + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinSecondFullFiscalYear
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Future Expected, Net Loss to be Expensed in Third Full Fiscal Year + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Net Loss to be Expensed, Present Value + References No definition available. + Details
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Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financial Guarantee Insurance Contracts, Net Loss to be Expensed, Undiscounted + References No definition available. + Details
Name: | ago_FinancialGuaranteeInsuranceContractsNetLosstobeExpensedUndiscounted
Namespace Prefix: | ago_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Schedule of Insured Financial Obligations with Credit Deterioration, Reductions of Gross Claim Liability, Net of Reinsurance Recoverable, Discount (Accretion) + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration