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Investments - Analysis of Cost or Amortized Cost, Gross Unrealized Gains and Losses and Fair Value for Investments (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 9,518 $ 9,324
Gross Unrealized Gains 647 431
Gross Unrealized Losses 27 105
Fair Value 10,138 9,650
Debt Securities | Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5,498 5,294
Gross Unrealized Gains 366 255
Gross Unrealized Losses 27 96
Fair Value 5,837 5,453
Debt Securities | States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,538 3,440
Gross Unrealized Gains 264 172
Gross Unrealized Losses 0 1
Fair Value 3,802 3,611
Debt Securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 293 287
Gross Unrealized Gains 17 4
Gross Unrealized Losses 0 2
Fair Value 310 289
Debt Securities | Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 170 284
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 6
Fair Value 170 278
Debt Securities | Foreign government    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 10 10
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 10 10
Debt Securities | Convertibles and bonds with warrants attached    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5 5
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 5 5
Debt Securities | United States government    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 4 4
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 4
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,189 2,938
Gross Unrealized Gains 2,118 1,819
Gross Unrealized Losses 65 51
Fair Value 5,242 4,706
Equity Securities | Common equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,002 2,749
Gross Unrealized Gains 2,080 1,787
Gross Unrealized Losses 65 51
Fair Value 5,017 4,485
Equity Securities | Nonredeemable preferred equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 187 189
Gross Unrealized Gains 38 32
Gross Unrealized Losses 0 0
Fair Value 225 221
Fixed Maturities And Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 12,707 12,262
Gross Unrealized Gains 2,765 2,250
Gross Unrealized Losses 92 156
Fair Value $ 15,380 $ 14,356