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Junior Subordinated Debt Securities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis three-month LIBOR    
Debt Instrument, Face Amount   $ 3,200  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 90 88  
Interest Expense, Junior Subordinated Debentures 261 261 $ 258
Senior notes      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 85 81  
Debt Instrument, Interest Rate, Stated Percentage 5.70%    
Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 3,200    
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 47 50  
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 $ 6 7  
Debt Instrument, Interest Rate, Stated Percentage 10.75%    
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 $ 17 18  
Debt Instrument, Interest Rate, Stated Percentage 6.40%    
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 $ 14 15  
Debt Instrument, Interest Rate, Stated Percentage 7.875%    
Junior Subordinated Debt Instrument Two [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 750 750  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 10 $ 10  
Debt Instrument, Interest Rate, Stated Percentage 9.25%