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Long-Term Debt and Credit Facilities - Narrative (Details)
$ in Millions
 12 Months Ended
Sep. 25, 2023
USD ($)
Aug. 21, 2023
USD ($)
Aug. 20, 2021
USD ($)
May 26, 2021
USD ($)
Dec. 20, 2006
USD ($)
period
Nov. 22, 2006
USD ($)
extension
rISK
May 18, 2004
USD ($)
Dec. 31, 2024
USD ($)
Trust
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]                    
Principal               $ 1,746 $ 1,746  
Issuance of long-term debt, net of issuance costs               0 345 $ 0
Repayments of long-term debt               0 330 2
Interest expense               91 90 $ 81
AGUS (Issuer | AGMH                    
Debt Instrument [Line Items]                    
Debt instrument, fair value disclosure               $ 154 154  
AG (U.S. domiciled) | AGM CPS securities                    
Debt Instrument [Line Items]                    
Number of custodial trusts | Trust               8    
Maximum stock purchase obligation of each custodial trust               $ 400    
Aggregate maximum stock purchase obligation of the custodial trusts               50    
Junior Subordinated Debt | AGMH                    
Debt Instrument [Line Items]                    
Principal           $ 300   $ 146 146  
Interest rate, added to base rate (as a percent)           2.33%        
Effective interest rate of debt (as a percent)           6.40%        
Number of times interest payment may be deferred           1        
Number of consecutive periods for which interest payments may be deferred | rISK           1        
Period for which interest payment may be deferred (in years)           10 years        
Number of times repayment date may be extended | extension           4        
Repayment date extension measurement period           5 years        
5% Senior Notes | Senior Notes | AGC                    
Debt Instrument [Line Items]                    
Repayments of long-term debt $ 330                  
AGUS 3.6% Senior Notes | Senior Notes | AGMH                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)     3.60%              
AGUS 3.6% Senior Notes | Senior Notes | AGC                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)               3.60%    
Principal     $ 400         $ 400 400  
Issuance of long-term debt, net of issuance costs     $ 395              
Redemption price percentage     100.00%              
Interest rate, added to base rate (as a percent)     0.30%              
AGUS 6.125% Senior Notes | Senior Notes | AGC                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)   6.125%           6.125%    
Principal   $ 350           $ 350 350  
Issuance of long-term debt, net of issuance costs   $ 345                
Redemption price percentage   100.00%                
Interest rate, added to base rate (as a percent)   0.30%                
AGUS 3.15% Senior Notes | Senior Notes | AGMH                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)       3.15%            
AGUS 3.15% Senior Notes | Senior Notes | AGC                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)               3.15%    
Principal       $ 500       $ 500 500  
Issuance of long-term debt, net of issuance costs       $ 494            
Redemption price percentage       100.00%            
Interest rate, added to base rate (as a percent)       0.25%            
AGUS 7% Senior Notes | Senior Notes | AGC                    
Debt Instrument [Line Items]                    
Interest rate of debt (as a percent)             700.00% 700.00%    
Principal             $ 200 $ 200 $ 200  
Issuance of long-term debt, net of issuance costs             $ 197      
Effective interest rate of debt (as a percent)               6.40%    
Enhanced Junior Subordinated Debentures | Junior Subordinated Debt | AGMH                    
Debt Instrument [Line Items]                    
Period prior to final repayment date before which debt cannot be repaid, redeemed, repurchased or defeased (in years)           20 years        
Enhanced Junior Subordinated Debentures | Junior Subordinated Debt | AGC                    
Debt Instrument [Line Items]                    
Principal         $ 150          
Interest rate, added to base rate (as a percent)         2.64%          
Number of times interest payment may be deferred         1          
Number of consecutive periods for which interest payments may be deferred | period         1          
Period for which interest payment may be deferred (in years)         10 years