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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Available-for-sale) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Amortized Cost $ 3,343 $ 3,777
Marketable Securities, Gross Unrealized Gain in Accumulated OCI 0 40
Marketable Securities, Gross Unrealized Loss in Accumulated OCI (45) (11)
Available-for-sale Securities 3,298 3,806
Available-for-sale Securities, Current 1,422 1,391
Available-for-sale Securities, Noncurrent 2,017 2,480
Available For Sale Securities Including Equity and Fixed Income Funds 4,037 3,938
Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Amortized Cost 15 141
Available-for-sale Securities 15 141
Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Amortized Cost 608 50
Available-for-sale Securities 608 50
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Amortized Cost 2,720 3,555
Marketable Securities, Gross Unrealized Gain in Accumulated OCI 0 3
Marketable Securities, Gross Unrealized Loss in Accumulated OCI (45) (10)
Available-for-sale Securities 2,675 3,548
Equity Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Marketable Securities, Amortized Cost 0 31
Marketable Securities, Gross Unrealized Gain in Accumulated OCI 0 37
Marketable Securities, Gross Unrealized Loss in Accumulated OCI 0 (1)
Available-for-sale Securities 0 67
Equity and fixed income funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities 739 132
Other assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities $ 598 $ 67