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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, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount $ (34) $ (36)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (69) (74)
Capital lease obligations 8 9
Long Term Debt Excluding Consolidated Securitization Entities Face Value 16,532 17,961
Long-term debt 16,429 17,851
Short-term debt 242 100
Debt And Capital Lease Obligations Face Value 16,774 18,061
Total $ 16,671 17,951
Senior notes    
Debt Instrument [Line Items]    
Weighted Average Interest Rate 4.94%  
Debt Instrument, Maturity Date Range, Start Dec. 15, 2017  
Debt Instrument, Maturity Date Range, End May 13, 2046  
Long-term Debt, Gross $ 15,597 17,025
Debt Instrument, Unamortized Discount (30) (31)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (62) (67)
Long-term Debt $ 15,505 16,927
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 (4) (5)
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (2) (2)
Long-term Debt $ 501 500
Other notes    
Debt Instrument [Line Items]    
Weighted Average Interest Rate 4.23%  
Debt Instrument, Maturity Date Range, Start Sep. 07, 2017  
Debt Instrument, Maturity Date Range, End Apr. 01, 2027  
Long-term Debt, Gross $ 420 420
Debt Instrument, Unamortized Discount 0 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (5) (5)
Long-term Debt 415 415
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount 0 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 0
Short-term Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unamortized Discount 0 0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 0 $ 0
Minimum | Senior notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 1.76%  
Minimum | Surplus notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 7.63%  
Minimum | Other notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 1.62%  
Maximum | Senior notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 7.72%  
Maximum | Surplus notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 7.88%  
Maximum | Other notes    
Debt Instrument [Line Items]    
Interest Rate Range Minimum 6.49%