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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (101) $ (108)
Finance Lease, Liability 6 32
Long Term Debt Excluding Consolidated Securitization Entities Face Value 15,187 15,656
Long-term debt 15,086 15,548
Short-term debt (includes $133 and $0, respectively, relating to variable interest entities) 465 119
Debt And Capital Lease Obligations Face Value 15,652 15,775
Total $ 15,551 $ 15,667
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-Term Debt and Lease Obligation, Including Current Maturities [Abstract]
Long-term Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 0 $ 0
Senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Principal Outstanding 14,530 14,622
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (99) (106)
Long-term Debt $ 14,431 14,516
Debt Instrument, Interest Rate, Stated Percentage 5.70%  
Surplus notes    
Debt Instrument [Line Items]    
Debt Instrument, Principal Outstanding $ 250 507
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 0
Long-term Debt 250 507
Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Principal Outstanding 401 495
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (2) (2)
Long-term Debt 399 493
Short-term Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 0 $ 0
Minimum | Senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 0.50%  
Minimum | Surplus notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 7.80%  
Minimum | Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 5.58%  
Maximum | Senior notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 6.50%  
Maximum | Surplus notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 7.80%  
Maximum | Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 8.39%  
Committed Credit Facility Six [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 2,896  
General Credit Facility Three [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000