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, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Trading, Amortized Cost $ 139 $ 152
Trading Securities, Gross Unrealized Gain 0 16
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 139 168
Available-for-sale Securities, Amortized Cost Basis 674 584
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (4) (4)
Available-for-sale Securities, Current 671 581
Marketable Securities, Amortized Cost, Total 813 736
Marketable Securities, Gross Unrealized Gain 1 17
Marketable Securities, Gross Unrealized Loss (4) (4)
Marketable securities 810 749
U.S. government and agency debt securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 297 286
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1 0
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (1) (3)
Available-for-sale Securities, Current 297 283
Mortgage and asset-backed debt securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 82 86
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 81 86
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Trading, Amortized Cost 137 75
Trading Securities, Gross Unrealized Gain 0 0
Trading Securities, Gross Unrealized Loss 0 0
Debt Securities, Trading, and Equity Securities, FV-NI 137 75
Available-for-sale Securities, Amortized Cost Basis 275 201
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 0 1
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax (2) (1)
Available-for-sale Securities, Current 273 201
Equity securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Trading, Amortized Cost 2  
Debt Securities, Trading, and Equity Securities, FV-NI 2  
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
Non-U.S. government debt securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 20 9
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 $ 20 9
Carbon credit investments(1)    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Trading, Amortized Cost   77
Trading Securities, Gross Unrealized Gain   16
Trading Securities, Gross Unrealized Loss   0
Debt Securities, Trading, and Equity Securities, FV-NI   $ 93