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Investments - Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Cost or Amortized Cost, Due in one year or less $ 1,144 $ 1,350
Cost or Amortized Cost, Due after one year through five years 7,718 7,979
Cost or Amortized Cost, Due after five years through ten years 16,874 16,859
Cost or Amortized Cost, Due after ten years 12,176 11,893
Cost or Amortized Cost, Total 37,912 38,081
Estimated Fair Value, Due in one year or less 1,155 1,359
Estimated Fair Value, Due after one year through five years 7,992 8,139
Estimated Fair Value, Due after five years through ten years 17,374 16,870
Estimated Fair Value, Due after ten years 14,004 13,174
Estimated Fair Value, Total $ 40,525 $ 39,542