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Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Cost |  |
Due in one year or less | $ 218 |
Due after one year through three years | 443 |
Due after three years through five years | 18 |
Due after five years | 75 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 754 |
Equity securities | 243 |
Total Amortized Cost | 997 | $ 1,083
Estimated Fair Value |  |
Due in one year or less | 218 |
Due after one year through three years | 442 |
Due after three years through five years | 18 |
Due after five years | 76 |
Marketable Securities, Debt Maturities, Fair Value, Total | 754 |
Equity securities | 289 |
Total Estimated Fair Value | $ 1,043 | $ 1,091

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