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Junior Subordinated Debt Securities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 10, 2017
Debt Instrument [Line Items]        
Debt Instrument, Description of Variable Rate Basis three-month LIBOR      
Debt Instrument, Face Amount $ 3,200 $ 3,200    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 87 95    
Interest Expense, Junior Subordinated Debentures 258 258 $ 258  
Senior notes        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 79 86    
Debt Instrument, Interest Rate, Stated Percentage 5.70%      
Debt Instrument, Maturity Date Jun. 30, 2035      
Junior Subordinated Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 53 56    
Junior Subordinated Debt Instrument One [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 500 500    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 7 7    
Debt Instrument, Interest Rate, Stated Percentage 10.75%      
Debt Instrument, Maturity Date Aug. 01, 2069      
Junior Subordinated Debt Instrument Four [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 1,250 1,250    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 19 21    
Debt Instrument, Interest Rate, Stated Percentage 6.40%      
Debt Instrument, Maturity Date Dec. 15, 2066      
Junior Subordinated Debt Instrument Three [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 700 700    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 16 17    
Debt Instrument, Interest Rate, Stated Percentage 7.875%      
Debt Instrument, Maturity Date Dec. 15, 2067      
Junior Subordinated Debt Instrument Two [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 750 750   $ 750
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 11 $ 11    
Debt Instrument, Interest Rate, Stated Percentage 9.25%     9.25%
Debt Instrument, Maturity Date Apr. 08, 2068