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Long-term and Short-term Debt (Long-term and Short-term Outstanding) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ (87) $ (95)
Capital lease obligations 4 5
Long Term Debt Excluding Consolidated Securitization Entities Face Value 12,911 15,775
Long-term debt 12,824 15,680
Short-term debt 268 477
Debt And Capital Lease Obligations Face Value 13,179 16,252
Total $ 13,092 16,157
Senior notes    
Debt Instrument [Line Items]    
Weighted Average Interest Rate 4.96%  
Debt Instrument, Maturity Date Range, Start Jun. 29, 2020  
Debt Instrument, Maturity Date Range, End May 13, 2046  
Long-term Debt, Gross $ 11,923 14,685
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (79) (86)
Long-term Debt $ 11,844 14,599
Surplus notes    
Debt Instrument [Line Items]    
Weighted Average Interest Rate 7.79%  
Debt Instrument, Maturity Date Range, Start Jan. 15, 2024  
Debt Instrument, Maturity Date Range, End Nov. 01, 2025  
Long-term Debt, Gross $ 507 507
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (4) (5)
Long-term Debt $ 503 502
Other notes (2)    
Debt Instrument [Line Items]    
Weighted Average Interest Rate 4.92%  
Debt Instrument, Maturity Date Range, Start Sep. 07, 2020  
Debt Instrument, Maturity Date Range, End Jan. 28, 2058  
Long-term Debt, Gross $ 477 578
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (4) (4)
Long-term Debt 473 574
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 0
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 3.00%  
Minimum | Surplus notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 7.63%  
Minimum | Other notes (2)    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 2.99%  
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 (2)    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 6.50%