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CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Cost |  |
Due in one year or less | $ 29 |
Due after one year through three years | 315 |
Due after three years through five years | 8 |
Due after five years | 39 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 391 |
Equity securities | 2 |
Total Amortized Cost | 393 | $ 497
Estimated Fair Value |  |
Due in one year or less | 30 |
Due after one year through three years | 320 |
Due after three years through five years | 8 |
Due after five years | 42 |
Marketable Securities, Debt Maturities, Fair Value, Total | 400 |
Equity securities | 2 |
Total Estimated Fair Value | $ 402 | $ 503

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