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Investments (Analysis Of Cost Or Amortized Cost Gross Unrealized Gains And Losses And Fair Value For Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Fixed Maturities    
Schedule of Available-for-sale Securities    
Cost or amortized cost $ 9,799 $ 9,324
Gross unrealized gains 359 431
Gross unrealized losses 73 105
Fair value 10,085 9,650
Fixed Maturities | Corporate Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 5,555 5,294
Gross unrealized gains 252 255
Gross unrealized losses 26 96
Fair value 5,781 5,453
Fixed Maturities | States, Municipalities and Political Subdivisions    
Schedule of Available-for-sale Securities    
Cost or amortized cost 3,770 3,440
Gross unrealized gains 100 172
Gross unrealized losses 42 1
Fair value 3,828 3,611
Fixed Maturities | Commercial Mortgage Backed Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 282 287
Gross unrealized gains 7 4
Gross unrealized losses 2 2
Fair value 287 289
Fixed Maturities | Government-Sponsored Enterprises    
Schedule of Available-for-sale Securities    
Cost or amortized cost 167 284
Gross unrealized gains 0 0
Gross unrealized losses 3 6
Fair value 164 278
Fixed Maturities | Foreign Government    
Schedule of Available-for-sale Securities    
Cost or amortized cost 10 10
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 10 10
Fixed Maturities | Convertibles and Bonds with Warrants Attached    
Schedule of Available-for-sale Securities    
Cost or amortized cost 10 5
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 10 5
Fixed Maturities | United States Government    
Schedule of Available-for-sale Securities    
Cost or amortized cost 5 4
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 5 4
Equity Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 2,995 2,938
Gross unrealized gains 2,348 1,819
Gross unrealized losses 9 51
Fair value 5,334 4,706
Equity Securities | Common Equities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 2,812 2,749
Gross unrealized gains 2,320 1,787
Gross unrealized losses 9 51
Fair value 5,123 4,485
Equity Securities | Nonredeemable Preferred Equities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 183 189
Gross unrealized gains 28 32
Gross unrealized losses 0 0
Fair value 211 221
Fixed Maturities And Equity Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 12,794 12,262
Gross unrealized gains 2,707 2,250
Gross unrealized losses 82 156
Fair value $ 15,419 $ 14,356