v3.25.1
Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Junior Subordinated Debt    
Guarantor Obligations [Line Items]    
Parental guarantees $ 617 $ 850
Performance Guarantee    
Guarantor Obligations [Line Items]    
Parental guarantees 2,400 2,500
Other investments | Unfunded Investment Commitments    
Guarantor Obligations [Line Items]    
Unfunded investment commitments 1,200  
Equity method investments | Unfunded Investment Commitments    
Guarantor Obligations [Line Items]    
Unfunded investment commitments 25  
Equity investments | Privately held | Unfunded Investment Commitments    
Guarantor Obligations [Line Items]    
Unfunded investment commitments 21  
Insurance-linked securities | Unfunded Investment Commitments    
Guarantor Obligations [Line Items]    
Unfunded investment commitments 10  
U.S. government and agency    
Guarantor Obligations [Line Items]    
Concentration of credit risk, counterparty credit exposure 1,100 917
Reinsurer Concentration Risk    
Guarantor Obligations [Line Items]    
Concentration of credit risk, counterparty credit exposure $ 3,700 $ 3,800