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Condensed Financial Information (Parent Company) (Junior Subordinated Debt- Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 10, 2017
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2016
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount   $ 3,200 $ 3,200  
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 8.595%      
Advances to Affiliate $ 750 100 100 $ 140
Junior Subordinated Debt Instrument Two [Member]        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount $ 750 $ 750 $ 750  
Debt Instrument, Interest Rate, Stated Percentage 9.25% 9.25%    
Debt Instrument, Maturity Date   Apr. 08, 2068    
Junior Subordinated Debt Instrument Two [Member] | Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Debt Instrument, Face Amount $ 750      
Debt Instrument, Interest Rate, Stated Percentage 9.25%      
Debt Instrument, Maturity Date Apr. 08, 2068