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Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cost |  |
Due in one year or less | $ 33 |
Due after one year through three years | 578 |
Due after three years through five years | 23 |
Due after five years | 75 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 709 |
Equity securities | 2 |
Total Amortized Cost | 711 | $ 813
Estimated Fair Value |  |
Due in one year or less | 33 |
Due after one year through three years | 578 |
Due after three years through five years | 23 |
Due after five years | 76 |
Marketable Securities, Debt Maturities, Fair Value, Total | 710 |
Equity securities | 2 |
Total Estimated Fair Value | $ 712 | $ 810

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