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Investments - Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Cost or Amortized Cost, Due in one year or less $ 1,665 $ 1,574
Cost or Amortized Cost, Due after one year through five years 9,052 7,738
Cost or Amortized Cost, Due after five years through ten years 14,659 14,652
Cost or Amortized Cost, Due after ten years 12,862 13,303
Cost or Amortized Cost, Total 38,238 37,267
Estimated Fair Value, Due in one year or less 1,710 1,595
Estimated Fair Value, Due after one year through five years 9,584 8,082
Estimated Fair Value, Due after five years through ten years 15,625 14,915
Estimated Fair Value, Due after ten years 15,400 14,989
Estimated Fair Value, Total $ 42,319 $ 39,581