v3.25.4
Basis of Presentation (Details)
shares in Millions, $ in Millions
 12 Months Ended
Feb. 06, 2026
USD ($)
Oct. 30, 2025
USD ($)
Oct. 27, 2025
USD ($)
Nov. 01, 2023
USD ($)
shares
Jul. 03, 2023
USD ($)
Dec. 31, 2025
USD ($)
country
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 02, 2024
USD ($)
Summary of Significant Accounting Policies [Line Items]                  
Number of countries in which the entity operates | country           200      
Net income (loss)           $ 3,097 $ (926) $ 3,878  
Disposal consideration                 $ 600
Transition services period                 30 months
Fronting agreement, percent                 1
Everest Group, Ltd. Renewal Rights                  
Summary of Significant Accounting Policies [Line Items]                  
Consideration transferred for renewal rights     $ 301            
Payments for reimbursable expenses for Everest     $ 30            
Purchase price adjustment period     90 days            
Purchase price adjustment, percent of actual premiums written (as a percent)     15.00%            
Reimbursable purchase price, percent of gross written premiums paid and payable less than aggregate premiums (as a percent)     80.00%            
Reimbursable purchase price, maximum amount     $ 70            
Transition services expense, per month amount     $ 10            
Term of transition services payments     9 months            
Convex Group Limited | Subsequent event                  
Summary of Significant Accounting Policies [Line Items]                  
Ownership (as a percent) 35.00%                
Consideration for equity method ownership $ 2,100                
Onex Corporation | Subsequent event                  
Summary of Significant Accounting Policies [Line Items]                  
Ownership (as a percent) 9.90%                
Consideration for equity method ownership $ 646                
Investment intent, amount $ 2,000                
Equity method investment period 3 years                
Sale of Assets | Validus Re                  
Summary of Significant Accounting Policies [Line Items]                  
Cash consideration for divestiture of business       $ 2,700          
Gain (loss) on disposal of business               (78)  
Share consideration received on transaction (in shares) | shares       1.3          
Value of share consideration received on transaction   $ 323   $ 290          
Sale of Assets | Crop Risk Services                  
Summary of Significant Accounting Policies [Line Items]                  
Cash consideration for divestiture of business         $ 234        
Gain (loss) on disposal of business               72  
Sale of Assets | Global Personal Travel Insurance                  
Summary of Significant Accounting Policies [Line Items]                  
Gain (loss) on disposal of business             511    
Parent Company                  
Summary of Significant Accounting Policies [Line Items]                  
Net income (loss)           3,096 3,038 2,765  
Total AIG Share- holders' Equity                  
Summary of Significant Accounting Policies [Line Items]                  
Net income (loss)           $ 3,096 $ (1,404) $ 3,643