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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
Sep. 30, 2015
Dec. 31, 2014
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost $ 9,320 $ 8,871
Gross Unrealized Gains 493 607
Gross Unrealized Losses 57 18
Fair Value 9,756 9,460
Debt Securities | Corporate    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 5,333 5,117
Gross Unrealized Gains 325 420
Gross Unrealized Losses 49 11
Fair Value 5,609 5,526
Debt Securities | States, municipalities and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 3,401 3,267
Gross Unrealized Gains 159 178
Gross Unrealized Losses 3 2
Fair Value 3,557 3,443
Debt Securities | Commercial mortgage-backed    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 284 250
Gross Unrealized Gains 9 9
Gross Unrealized Losses 1 0
Fair Value 292 259
Debt Securities | Government-sponsored enterprises    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 280 213
Gross Unrealized Gains 0 0
Gross Unrealized Losses 4 5
Fair Value 276 208
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 8 7
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 8 7
Debt Securities | United States government    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 4 7
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 4 7
Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,970 2,728
Gross Unrealized Gains 1,613 2,134
Gross Unrealized Losses 57 4
Fair Value 4,526 4,858
Equity Securities | Common equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 2,784 2,583
Gross Unrealized Gains 1,585 2,099
Gross Unrealized Losses 56 3
Fair Value 4,313 4,679
Equity Securities | Nonredeemable preferred equities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 186 145
Gross Unrealized Gains 28 35
Gross Unrealized Losses 1 1
Fair Value 213 179
Fixed Maturities And Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Cost or Amortized Cost 12,365 11,599
Gross Unrealized Gains 2,106 2,741
Gross Unrealized Losses 114 22
Fair Value $ 14,357 $ 14,318