    <SEC-DOCUMENT>0001273813-25-000013-index.html : 20250314
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    <ACCEPTANCE-DATETIME>20250314161131
    ACCESSION NUMBER:		0001273813-25-000013
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20250314
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20250314
    DATE AS OF CHANGE:		20250314

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ASSURED GUARANTY LTD
    		CENTRAL INDEX KEY:			0001273813
    		STANDARD INDUSTRIAL CLASSIFICATION:	SURETY INSURANCE [6351]
    		ORGANIZATION NAME:           	02 Finance
    		IRS NUMBER:				000000000
    		STATE OF INCORPORATION:			D0
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-32141
    		FILM NUMBER:		25740106

    	BUSINESS ADDRESS:
    		STREET 1:		30 WOODBOURNE AVE
    		STREET 2:		5TH FLOOR
    		CITY:			HAMILTON BERMUDA
    		STATE:			D0
    		ZIP:			HM08
    		BUSINESS PHONE:		441-279-5700

    	MAIL ADDRESS:
    		STREET 1:		30 WOODBOURNE AVE
    		STREET 2:		5TH FLOOR
    		CITY:			HAMILTON BERMUDA
    		STATE:			D0
    		ZIP:			HM08

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AGR LTD
    		DATE OF NAME CHANGE:	20040122

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	AGC HOLDINGS LTD
    		DATE OF NAME CHANGE:	20031218
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>ago-20250314.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: ago-20250314.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>gaapag4q2024fs.htm
    <DESCRIPTION>AG FINANCIAL STATEMENTS
    <TEXT>
    Document 2 - file: gaapag4q2024fs.htm

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    <SEQUENCE>3
    <FILENAME>ago-20250314.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
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    <FILENAME>ago-20250314_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>5
    <FILENAME>ago-20250314_lab.xml
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    <TEXT>
    Document 5 - file: ago-20250314_lab.xml

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    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>6
    <FILENAME>ago-20250314_pre.xml
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    <TEXT>
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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>ago-20250314_g1.jpg
    <TEXT>
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    <TYPE>XML
    <SEQUENCE>9
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 9 - file: R1.htm

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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>10
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 10 - file: Financial_Report.xlsx

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: Show.js

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    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>report.css
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    <TEXT>
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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    Document 14 - RAW XML: FilingSummary.xml

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    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>16
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
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    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>17
    <FILENAME>0001273813-25-000013-xbrl.zip
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    <TEXT>
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    <TYPE>XML
    <SEQUENCE>18
    <FILENAME>ago-20250314_htm.xml
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    <TEXT>
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