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Fair Value (Assets and liabilities measured at fair value) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets    
Fixed maturity securities $ 39,628 $ 41,487
Equity securities 795  
Equity securities   695
Short term and other 1,183 1,354
Assets 41,606 43,536
Liabilities    
Other liabilities (6) 3
Liabilities (6) 3
Corporate and other bonds    
Assets    
Fixed maturity securities 19,631 19,374
States, municipalities and political subdivisions    
Assets    
Fixed maturity securities 11,145 14,027
Asset-backed    
Assets    
Fixed maturity securities 8,852 8,086
Common Stock    
Assets    
Equity securities 105  
Equity securities   27
Preferred stock    
Assets    
Equity securities 690  
Equity securities   668
Level 1    
Assets    
Fixed maturity securities 183 128
Equity securities 152  
Equity securities   91
Short term and other 252 396
Assets 587 615
Liabilities    
Other liabilities 0 0
Liabilities 0 0
Level 1 | Corporate and other bonds    
Assets    
Fixed maturity securities 183 128
Level 1 | States, municipalities and political subdivisions    
Assets    
Fixed maturity securities 0 0
Level 1 | Asset-backed    
Assets    
Fixed maturity securities 0 0
Level 1 | Common Stock    
Assets    
Equity securities 101  
Equity securities   23
Level 1 | Preferred stock    
Assets    
Equity securities 51  
Equity securities   68
Level 2    
Assets    
Fixed maturity securities 38,959 40,925
Equity securities 625  
Equity securities   584
Short term and other 931 958
Assets 40,515 42,467
Liabilities    
Other liabilities (6) 3
Liabilities (6) 3
Level 2 | Corporate and other bonds    
Assets    
Fixed maturity securities 19,260 19,148
Level 2 | States, municipalities and political subdivisions    
Assets    
Fixed maturity securities 11,145 14,026
Level 2 | Asset-backed    
Assets    
Fixed maturity securities 8,554 7,751
Level 2 | Common Stock    
Assets    
Equity securities 0  
Equity securities   0
Level 2 | Preferred stock    
Assets    
Equity securities 625  
Equity securities   584
Level 3    
Assets    
Fixed maturity securities 486 434
Equity securities 18  
Equity securities   20
Short term and other 0 0
Assets 504 454
Liabilities    
Other liabilities 0 0
Liabilities 0 0
Level 3 | Corporate and other bonds    
Assets    
Fixed maturity securities 188 98
Level 3 | States, municipalities and political subdivisions    
Assets    
Fixed maturity securities 0 1
Level 3 | Asset-backed    
Assets    
Fixed maturity securities 298 335
Level 3 | Common Stock    
Assets    
Equity securities 4  
Equity securities   4
Level 3 | Preferred stock    
Assets    
Equity securities $ 14  
Equity securities   $ 16