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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, 2017 | Dec. 31, 2016
--- | --- | ---
Cost |  |
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 112 |
Due after one year through three years | 453 |
Due after three years through five years | 21 |
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis | 73 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 659 |
Equity securities | 77 |
Marketable Securities, Amortized Cost, Total | 736 | $ 1,083
Estimated Fair Value |  |
Due in one year or less | 112 |
Due after one year through three years | 449 |
Due after three years through five years | 21 |
Due after five years | 74 |
Marketable Securities, Debt Maturities, Fair Value, Total | 656 |
Equity securities | 93 |
Marketable securities | 749 | 1,091
Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 774 | 1,122
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 395 | 420
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 373 | 689
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 6 | 13
Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 749 | 1,091
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 376 | 402
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 373 | 689
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 | 25 | 31
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 19 | 18
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 | 6 | 13
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 283 | 312
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 | 283 | 312
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 | 86 | 91
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 | 86 | 91
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 | 276 | 593
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 | 276 | 593
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 | 9 | 3
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 | 9 | 3
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 | 90
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 93 | 90
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Carbon credit investments(1) | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | $ 0 | $ 0

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