| CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019 | 
|---|---|---|
| Cost | ||
| Due in one year or less | $ 20 | |
| Due after one year through three years | 324 | |
| Due after three years through five years | 6 | |
| Due after five years | 40 | |
| Marketable Securities, Debt Maturities, Amortized Cost, Total | 390 | |
| Equity securities | 2 | |
| Total Amortized Cost | 392 | $ 497 | 
| Estimated Fair Value | ||
| Due in one year or less | 20 | |
| Due after one year through three years | 332 | |
| Due after three years through five years | 6 | |
| Due after five years | 43 | |
| Marketable Securities, Debt Maturities, Fair Value, Total | 401 | |
| Equity securities | 2 | |
| Total Estimated Fair Value | $ 403 | $ 503 | 
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- Definition Marketable Securities, Fair Value [Abstract] No definition available. 
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- Definition Marketable Securities, Amortized Cost [Abstract] No definition available. 
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- Definition Marketable Securities, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, After Five Years, Fair Value No definition available. 
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- Definition Marketable Securities, Debt Maturities, After One Through Three Years, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, After One Through Three Years, Fair Value No definition available. 
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- Definition Marketable Securities, Debt Maturities, After Three Through Five Years, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, After Three Through Five Years, Fair Value No definition available. 
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- Definition Marketable Securities, Debt Maturities, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, Fair Value No definition available. 
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- Definition Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Debt Maturities, Next Twelve Months, Fair Value No definition available. 
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- Definition Marketable Securities, Equity Securities, Amortized Cost Basis No definition available. 
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- Definition Marketable Securities, Equity Securities, Fair Value No definition available. 
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- Definition Amount of investment in marketable security, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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