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Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cost |  |
Due in one year or less | $ 147 |
Due after one year through three years | 472 |
Due after three years through five years | 21 |
Due after five years | 77 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 717 |
Equity securities | 2 |
Total Amortized Cost | 719 | $ 813
Estimated Fair Value |  |
Due in one year or less | 147 |
Due after one year through three years | 474 |
Due after three years through five years | 22 |
Due after five years | 80 |
Marketable Securities, Debt Maturities, Fair Value, Total | 723 |
Equity securities | 2 |
Total Estimated Fair Value | $ 725 | $ 810

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