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Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cost |  |
Due in one year or less | $ 230 |
Due after one year through three years | 424 |
Due after three years through five years | 21 |
Due after five years | 75 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 750 |
Equity securities | 2 |
Total Amortized Cost | 752 | $ 736
Estimated Fair Value |  |
Due in one year or less | 228 |
Due after one year through three years | 420 |
Due after three years through five years | 21 |
Due after five years | 73 |
Marketable Securities, Debt Maturities, Fair Value, Total | 742 |
Equity securities | 2 |
Total Estimated Fair Value | $ 744 | $ 749

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