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CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Cost |  |
Due in one year or less | $ 35 |
Due after one year through three years | 310 |
Due after three years through five years | 0 |
Due after five years | 0 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 345 |
Equity securities | 2 |
Total Amortized Cost | 347 | $ 398
Estimated Fair Value |  |
Due in one year or less | 36 |
Due after one year through three years | 313 |
Due after three years through five years | 0 |
Due after five years | 0 |
Marketable Securities, Debt Maturities, Fair Value, Total | 349 |
Equity securities | 2 |
Total Estimated Fair Value | $ 351 | $ 406

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