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CASH AND INVESTMENTS - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 152 | $ 507
Trading Securities, Gross Unrealized Gain | 16 | 10
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 168 | 517
Available-for-sale Securities, Amortized Cost Basis | 584 | 576
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (4) | (3)
Available-for-sale Securities, Current | 581 | 574
Marketable Securities, Amortized Cost, Total | 736 | 1,083
Marketable Securities, Gross Unrealized Gain | 17 | 11
Marketable Securities, Gross Unrealized Loss | (4) | (3)
Marketable securities | 749 | 1,091
U.S. government and agency debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 286 | 314
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (3) | (2)
Available-for-sale Securities, Current | 283 | 312
Mortgage and asset-backed debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 86 | 90
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 86 | 91
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 75 | 427
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 75 | 427
Available-for-sale Securities, Amortized Cost Basis | 201 | 167
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Available-for-sale Securities, Current | 201 | 166
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2 | 2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 2 | 2
Non-U.S. government debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 9 | 3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities, Current | 9 | 3
Carbon credit investments(1) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 77 | 80
Trading Securities, Gross Unrealized Gain | 16 | 10
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | $ 93 | $ 90

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