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Condensed Financial Information (Parent Company) (Long-term and Short-term Debt Footnote) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 12, 2018
Jun. 22, 2017
Condensed Financial Statements, Captions [Line Items]              
Long-term debt outstanding     $ 4,365 $ 3,963      
Debt instrument, unamortized debt issuance costs and debt discount     42 46      
Long-term debt maturities, year one     2        
Long-term debt maturities, year two     2        
Long-term debt maturities, year three     2        
Long-term debt maturities, year four     2        
Long-term debt maturities, year five     1,000        
Long-term debt maturities, after year five     3,400        
Interest expense on long-term debt     $ 191 158 $ 135    
Term Loan Due 2024              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, basis spread on variable rate debt     1.50%        
Long-term debt outstanding     $ 1,000        
Term Loan Due 2019              
Condensed Financial Statements, Captions [Line Items]              
Long-term debt outstanding       600      
Senior Notes Due 2027              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     3.70%       3.70%
Long-term debt outstanding     $ 1,492 1,490      
Senior Notes Due 2047              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     4.70%       4.70%
Long-term debt outstanding     $ 1,478 1,478      
Junior Subordinated Debentures Due 2058              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     6.25%     6.25%  
Long-term debt outstanding     $ 363 361      
Parent Company              
Condensed Financial Statements, Captions [Line Items]              
Long-term debt outstanding     4,333 3,929      
Short-term debt outstanding     343 303      
Long-term and short-term debt outstanding     4,676 4,232      
Debt instrument, unamortized debt issuance costs and debt discount     42 46      
Long-term debt maturities, year one     343        
Long-term debt maturities, year two     0        
Long-term debt maturities, year three     0        
Long-term debt maturities, year four     0        
Long-term debt maturities, year five     1,000        
Long-term debt maturities, after year five     3,400        
Interest expense on long-term debt     $ 191 157 75    
Parent Company | Term Loan Due 2024              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, basis spread on variable rate debt     1.50%        
Long-term debt outstanding     $ 1,000        
Parent Company | Term Loan Due 2019              
Condensed Financial Statements, Captions [Line Items]              
Long-term debt outstanding       600      
Parent Company | Short-term Intercompany Loans              
Condensed Financial Statements, Captions [Line Items]              
Short-term intercompany debt issued     1,200 478 136    
Short-term intercompany debt repaid     $ 1,100 $ 311 $ 0    
Weighted average interest rate     0.95% 1.80% 0.73%    
Parent Company | Intercompany Liquidity Facilities              
Condensed Financial Statements, Captions [Line Items]              
Short-term intercompany debt issued   $ 40 $ 0   $ 0    
Short-term intercompany debt repaid $ 40   $ 0   $ 0    
Maximum borrowing and lending limit applied to the respective insurance subsidiary's statutory admitted assets     3.00%        
Parent Company | Senior Notes Due 2027              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     3.70%        
Long-term debt outstanding     $ 1,492 $ 1,490      
Parent Company | Senior Notes Due 2047              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     4.70%        
Long-term debt outstanding     $ 1,478 1,478      
Parent Company | Junior Subordinated Debentures Due 2058              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument, stated interest rate     6.25%        
Long-term debt outstanding     $ 363 $ 361