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CASH AND INVESTMENTS - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 507 | $ 1,425
Trading Securities, Gross Unrealized Gain | 10 | 9
Trading Securities, Gross Unrealized Loss | 0 | (5)
Trading Securities | 517 | 1,429
Available-for-sale Securities, Amortized Cost Basis | 576 | 569
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (3) | (3)
Available-for-sale Securities, Current | 574 | 567
Marketable Securities, Amortized Cost, Total | 1,083 | 1,994
Marketable Securities, Gross Unrealized Gain | 11 | 10
Marketable Securities, Gross Unrealized Loss | (3) | (8)
Marketable securities | 1,091 | 1,996
U.S. government and agency debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 314 | 341
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (2) | (1)
Available-for-sale Securities, Current | 312 | 340
Mortgage and asset-backed debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 90 | 74
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (1)
Available-for-sale Securities, Current | 91 | 74
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 427 | 715
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 427 | 715
Available-for-sale Securities, Amortized Cost Basis | 167 | 147
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Available-for-sale Securities, Current | 166 | 146
U.S. state and local municipal debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0
Available-for-sale Securities, Current |  | 2
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] |  |
Trading Securities, Short-term Investments, Amortized Cost |  | 363
Trading Securities, Gross Unrealized Gain |  | 0
Trading Securities, Gross Unrealized Loss |  | 0
Trading Securities |  | 363
Available-for-sale Securities, Amortized Cost Basis | 3 | 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 | 3 | 3
Carbon credit investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 80 | 347
Trading Securities, Gross Unrealized Gain | 10 | 9
Trading Securities, Gross Unrealized Loss | 0 | (5)
Trading Securities | $ 90 | $ 351

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