Common Shares Common Stock [Member] Entity Tax Identification Number Entity Tax Identification Number Entity File Number Entity File Number Cover [Abstract] Cover [Abstract] Title of 12(b) Security Title of 12(b) Security Entities [Table] Entities [Table] Local Phone Number Local Phone Number New York Stock Exchange NEW YORK STOCK EXCHANGE, INC. [Member] Class of Stock [Domain] Class of Stock [Domain] Soliciting Material Soliciting Material Entity Address, Address Line One Entity Address, Address Line One Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Assured Guaranty US Holdings Inc. 3.600% Senior Notes due 2051 Assured Guaranty US Holdings Inc. 3.600% Senior Notes due 2051 [Member] Assured Guaranty US Holdings Inc. 3.600% Senior Notes due 2051 Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Written Communications Written Communications Entity Information [Line Items] Entity Information [Line Items] Trading Symbol Trading Symbol Exchange [Domain] Exchange [Domain] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] City Area Code City Area Code Document Period End Date Document Period End Date Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Address, City or Town Entity Address, City or Town Entity Address, Country Entity Address, Country Assured Guaranty US Holdings Inc. 3.150% Senior Notes due 2031 Assured Guaranty US Holdings Inc. 3.150% Senior Notes due 2031 [Member] Assured Guaranty US Holdings Inc. 3.150% Senior Notes due 2031 Security Exchange Name Security Exchange Name Assured Guaranty US Holdings Inc. 6.125% Senior Notes Due 2028 Assured Guaranty US Holdings Inc. 6.125% Senior Notes Due 2028 [Member] Assured Guaranty US Holdings Inc. 6.125% Senior Notes Due 2028 Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Entity Emerging Growth Company Entity Emerging Growth Company