Annual report pursuant to Section 13 and 15(d)

CASH AND INVESTMENTS - Summary of Marketable Securities (Detail)

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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