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Fair Value Measurement - Additional Information (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Trust
security
Dec. 31, 2023
security
Aug. 01, 2024
USD ($)
Puerto Rico Trusts | Financial Guaranty Variable Interest Entities      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of fixed maturity debt securities classified as Level 3 | security 1 1  
Subsequent Event      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Share value, amount | $     $ 400
Total      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Percentage of CDS contracts fair valued using minimum premium 15.80% 11.50%  
AG And AGM      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of custodial trusts | Trust 4    
Share value, amount | $ $ 200    
Maximum amount | $ $ 50    
AGC      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of custodial trusts | Trust 4    
Assured Guaranty Municipal Corp.      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of custodial trusts | Trust 4    
Recurring | Level 3      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Number of fixed maturity securities valued using model processes | security 177    
Recurring | Level 3 | CDR | Total | Minimum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Conditional prepayment rate 3.58% 3.26%  
Recurring | Level 3 | CDR | Total | Maximum      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Conditional prepayment rate 4.89% 4.81%