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Insurance In Force (Summary Of Company's Reinsurance Agreements For U.S. Public Finance And Structured Finance And International Insurance Operations) (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Ceded Par Outstanding $ 671 $ 782
Letters of Credit/Trust Accounts 21  
Reinsurance Recoverable/ (Payable) Net [1] 14  
Assured Guaranty Re Ltd [Member]    
Ceded Par Outstanding [2] 348  
Letters of Credit/Trust Accounts [2] 21  
Reinsurance Recoverable/ (Payable) Net [1],[2] 13  
Assured Guaranty Inc [Member]    
Ceded Par Outstanding [2] 317  
Letters of Credit/Trust Accounts [2] 0  
Reinsurance Recoverable/ (Payable) Net [2] 1  
Others [Member]    
Ceded Par Outstanding [2] 6  
Letters of Credit/Trust Accounts [2] 0  
Reinsurance Recoverable/ (Payable) Net [1],[2] $ 0  
[1] Represents a withdrawal of ratings.
[2] Total reinsurance recoverable/(payable) is primarily related to recoverables on paid and unpaid losses net of paid and unpaid salvage due to reinsurers