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CASH AND INVESTMENTS - Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cost |  |
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 268 |
Due after one year through three years | 448 |
Due after three years through five years | 22 |
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis | 73 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 811 |
Equity securities | 2 |
Marketable Securities, Amortized Cost, Total | 813 | $ 736
Estimated Fair Value |  |
Due in one year or less | 267 |
Due after one year through three years | 447 |
Due after three years through five years | 22 |
Due after five years | 72 |
Marketable Securities, Debt Maturities, Fair Value, Total | 808 |
Equity securities | 2 |
Marketable securities | 810 | 749
Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 831 | 774
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 316 | 395
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 513 | 373
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 6
Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 810 | 749
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 297 | 376
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 513 | 373
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Other Long-term Investments | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 21 | 25
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 19 | 19
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 6
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 297 | 283
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 297 | 283
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 81 | 86
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 81 | 86
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 410 | 276
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 410 | 276
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 20 | 9
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 20 | 9
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | $ 0 | 0
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure |  | 93
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure |  | 93
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure |  | 0
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure |  | $ 0

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