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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (108) $ (87)
Finance Lease, Liability 32 56
Long Term Debt Excluding Consolidated Securitization Entities Face Value 15,656 14,734
Long-term debt 15,548 14,647
Short-term debt 119 175
Debt And Capital Lease Obligations Face Value 15,775 14,909
Total $ 15,667 $ 14,822
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 14,622 13,671
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (106) (83)
Long-term Debt $ 14,516 13,588
Debt Instrument, Interest Rate, Stated Percentage 5.70%  
Surplus notes    
Debt Instrument [Line Items]    
Debt Instrument, Principal Outstanding $ 507 507
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 (1)
Long-term Debt 507 506
Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Principal Outstanding 495 500
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (2) (3)
Long-term Debt 493 497
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 7.63%  
Minimum | Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 2.03%  
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 7.88%  
Maximum | Other notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 8.43%  
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