FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Available-for-Sale) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Amortized Cost	$ 3,777				$ 4,753
Marketable Securities, Unrealized Gain in Accumulated OCI	40				10
Marketable Securities, Gross Unrealized Loss in Accumulated OCI	(11)				(15)
Available-for-sale securities	3,806				4,748
Total securities	3,938				4,856
Marketable securities	3,871	$ 5,004	$ 5,615	$ 4,884	4,832	$ 5,163	$ 4,998	$ 5,352
Available For Sale Securities Including Equity and Fixed Income Funds	3,938				4,856
Current marketable securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	1,391				2,113
Non-current marketable securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	2,480				2,719
Other assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities	67				24
Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Amortized Cost	141				27
Available-for-sale securities	141				27
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Amortized Cost	50				750
Available-for-sale securities	50				750
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Amortized Cost	3,555				3,945
Marketable Securities, Unrealized Gain in Accumulated OCI	3				10
Marketable Securities, Gross Unrealized Loss in Accumulated OCI	(10)				(8)
Available-for-sale securities	3,548				3,947
Equity investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Amortized Cost	31				31
Marketable Securities, Unrealized Gain in Accumulated OCI	37
Marketable Securities, Gross Unrealized Loss in Accumulated OCI	(1)				(7)
Available-for-sale securities	67				24
Equity and fixed income funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 132				$ 108