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CASH AND INVESTMENTS - Summary of Marketable Securities (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | $ 1,425 | $ 430
Trading Securities, Gross Unrealized Gain | 9 | 0
Trading Securities, Gross Unrealized Loss | (5) | 0
Trading Securities | 1,429 | 430
Available-for-sale Securities, Amortized Cost Basis | 569 | 562
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 2
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (3) | (2)
Available-for-sale Securities, Current | 567 | 562
Marketable Securities, Amortized Cost, Total | 1,994 | 992
Marketable Securities, Gross Unrealized Gain | 10 | 2
Marketable Securities, Gross Unrealized Loss | (8) | (2)
Marketable securities | 1,996 | 992
U.S. government and agency debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 341 | 321
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Available-for-sale Securities, Current | 340 | 321
Mortgage and asset-backed debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 74 | 89
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1 | 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | (1)
Available-for-sale Securities, Current | 74 | 89
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 715 | 388
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 715 | 388
Available-for-sale Securities, Amortized Cost Basis | 147 | 146
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax | (1) | 0
Available-for-sale Securities, Current | 146 | 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 | 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
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 2 | 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 | 2 | 3
Non-U.S. government debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 363 | 42
Trading Securities, Gross Unrealized Gain | 0 | 0
Trading Securities, Gross Unrealized Loss | 0 | 0
Trading Securities | 363 | 42
Available-for-sale Securities, Amortized Cost Basis | 3 | 1
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 | 1
Carbon credit investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Trading Securities, Short-term Investments, Amortized Cost | 347 | 0
Trading Securities, Gross Unrealized Gain | 9 | 0
Trading Securities, Gross Unrealized Loss | (5) | 0
Trading Securities | $ 351 | $ 0

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