    <SEC-DOCUMENT>0001273813-23-000008-index.html : 20230302
    <SEC-HEADER>0001273813-23-000008.hdr.sgml : 20230302
    <ACCEPTANCE-DATETIME>20230301191833
    ACCESSION NUMBER:		0001273813-23-000008
    CONFORMED SUBMISSION TYPE:	8-K/A
    PUBLIC DOCUMENT COUNT:		18
    CONFORMED PERIOD OF REPORT:	20230228
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20230302
    DATE AS OF CHANGE:		20230301

    FILER:

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

    	FILING VALUES:
    		FORM TYPE:		8-K/A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-32141
    		FILM NUMBER:		23695779

    	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/A
    <SEQUENCE>1
    <FILENAME>ago-20230228.htm
    <DESCRIPTION>8-K/A
    <TEXT>
    Document 1 - file: ago-20230228.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>agl4q22pressrelease.htm
    <DESCRIPTION>AGL PRESS RELEASE
    <TEXT>
    Document 2 - file: agl4q22pressrelease.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.2
    <SEQUENCE>3
    <FILENAME>agl4q22supplement.htm
    <DESCRIPTION>AGL FINANCIAL SUPPLEMENT
    <TEXT>
    Document 3 - file: agl4q22supplement.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>ago-20230228.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT
    <TEXT>
    Document 4 - file: ago-20230228.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.DEF
    <SEQUENCE>5
    <FILENAME>ago-20230228_def.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT
    <TEXT>
    Document 5 - file: ago-20230228_def.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>6
    <FILENAME>ago-20230228_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT
    <TEXT>
    Document 6 - file: ago-20230228_lab.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>7
    <FILENAME>ago-20230228_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT
    <TEXT>
    Document 7 - file: ago-20230228_pre.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>agllogo.jpg
    <TEXT>
    Document 8 - file: agllogo.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>agllogo1.jpg
    <TEXT>
    Document 9 - file: agllogo1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>ago-20230228_g1.jpg
    <TEXT>
    Document 10 - file: ago-20230228_g1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>11
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 11 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>12
    <FILENAME>ago-20230228_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 12 - file: ago-20230228_htm.html

    Document 12 - RAW XML: ago-20230228_htm.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>13
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 13 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>15
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>16
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: FilingSummary.html

    Document 16 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>18
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 18 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>19
    <FILENAME>0001273813-23-000008-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: 0001273813-23-000008-xbrl.zip

    </DOCUMENT>
    </SEC-DOCUMENT>