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Insurance Company Regulatory Requirements - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
GBP (£)
Dec. 31, 2022
EUR (€)
Statutory Accounting Practices [Line Items]                  
Dividends paid $ 67 $ 64 $ 66            
AGUK                  
Statutory Accounting Practices [Line Items]                  
Own funds 672 716       £ 528   £ 592  
AGE                  
Statutory Accounting Practices [Line Items]                  
Own funds $ 49 $ 56         € 44   € 52
Assured Guaranty Municipal Corp And Municipal Assurance Corp | New York                  
Statutory Accounting Practices [Line Items]                  
Threshold for dividend payments as a percentage of policyholder surplus 10.00%                
Threshold for dividend payments, percentage of adjusted net investment income 100.00%                
Assured Guaranty Municipal Corp | New York | Forecast                  
Statutory Accounting Practices [Line Items]                  
Amount available for distribution, current year       $ 265          
Amount available for distribution, next fiscal quarter         $ 47        
AGC | Maryland                  
Statutory Accounting Practices [Line Items]                  
Threshold for dividend payments as a percentage of policyholder surplus 10.00%                
Threshold for dividend payments, percentage of adjusted net investment income 100.00%                
AGC | Maryland | Forecast                  
Statutory Accounting Practices [Line Items]                  
Amount available for distribution, next fiscal quarter         $ 35        
AGC | Maryland | AGC                  
Statutory Accounting Practices [Line Items]                  
Amount available for distribution, current year $ 117                
AG Re | Bermuda                  
Statutory Accounting Practices [Line Items]                  
Amount available for distribution, current year $ 226                
Dividend payment restrictions, percentage of statutory capital 15.00%                
Dividend restrictions on statutory capital and surplus (as a percent) 25.00%                
Capital distributions $ 129                
Statutory surplus 226                
Unencumbered assets 138                
Statutory amount available for dividend payments, deficit 47                
AGRO | Bermuda                  
Statutory Accounting Practices [Line Items]                  
Amount available for distribution, current year 103                
Capital distributions 21                
Statutory surplus 103                
Unencumbered assets 383                
Statutory amount available for dividend payments $ (275)