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Investments - Available-for-Sale Fixed Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Cost or Amortized Cost, Due in one year or less | $ 1,018 | $ 1,350
Cost or Amortized Cost, Due after one year through five years | 8,097 | 7,979
Cost or Amortized Cost, Due after five years through ten years | 16,403 | 16,859
Cost or Amortized Cost, Due after ten years | 12,505 | 11,893
Cost or Amortized Cost, Total | 38,023 | 38,081
Estimated Fair Value, Due in one year or less | 1,032 | 1,359
Estimated Fair Value, Due after one year through five years | 8,476 | 8,139
Estimated Fair Value, Due after five years through ten years | 17,297 | 16,870
Estimated Fair Value, Due after ten years | 14,834 | 13,174
Estimated Fair Value, Total | $ 41,639 | $ 39,542

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