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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, 2017
Dec. 31, 2016
Fixed Maturities    
Schedule of Available-for-sale Securities    
Cost or amortized cost $ 10,314 $ 9,799
Gross unrealized gains 409 359
Gross unrealized losses 24 73
Fair value 10,699 10,085
Fixed Maturities | Corporate Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 5,420 5,555
Gross unrealized gains 246 252
Gross unrealized losses 13 26
Fair value 5,653 5,781
Fixed Maturities | States, Municipalities and Political Subdivisions    
Schedule of Available-for-sale Securities    
Cost or amortized cost 4,316 3,770
Gross unrealized gains 155 100
Gross unrealized losses 6 42
Fair value 4,465 3,828
Fixed Maturities | Commercial Mortgage Backed Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 280 282
Gross unrealized gains 7 7
Gross unrealized losses 1 2
Fair value 286 287
Fixed Maturities | Government-Sponsored Enterprises    
Schedule of Available-for-sale Securities    
Cost or amortized cost 257 167
Gross unrealized gains 1 0
Gross unrealized losses 4 3
Fair value 254 164
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   5
Gross unrealized gains   0
Gross unrealized losses   0
Fair value   5
Fixed Maturities | United States Government    
Schedule of Available-for-sale Securities    
Cost or amortized cost 31 10
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 31 10
Equity Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 3,094 2,995
Gross unrealized gains 3,169 2,348
Gross unrealized losses 14 9
Fair value 6,249 5,334
Equity Securities | Common Equities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 2,918 2,812
Gross unrealized gains 3,135 2,320
Gross unrealized losses 14 9
Fair value 6,039 5,123
Equity Securities | Nonredeemable Preferred Equities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 176 183
Gross unrealized gains 34 28
Gross unrealized losses 0 0
Fair value 210 211
Fixed Maturities And Equity Securities    
Schedule of Available-for-sale Securities    
Cost or amortized cost 13,408 12,794
Gross unrealized gains 3,578 2,707
Gross unrealized losses 38 82
Fair value $ 16,948 $ 15,419