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Document and Entity Information
Jul. 06, 2021
Document And Entity Information [Line Items]  
Entity Registrant Name AMBAC FINANCIAL GROUP INC
Entity Address, State or Province NY
Amendment Flag false
Entity Central Index Key 0000874501
Document Type 8-K
Document Period End Date Jul. 06, 2021
Entity Incorporation State Country Code DE
Entity File Number 1-10777
Entity Tax Identification Number 13-3621676
Entity Address, Address Line One One World Trade Center
Entity Address, City or Town New York
Entity Address, Postal Zip Code 10007
City Area Code (212)
Local Phone Number 658-7470
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common stock, par value $0.01 per share
Trading Symbol AMBC
Security Exchange Name NYSE
Warrant [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Warrants
Trading Symbol AMBC WS
Security Exchange Name NYSE