CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES - MATURITIES (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Cost Basis [Abstract]
Due in one year or less	$ 258
Due after one year through five years	1,218
Due after five years through 10 years	2
Due after 10 years			$ 0
Marketable securities, Cost Basis	1,478	$ 1,260
Fair Value [Abstract]
Due in one year or less	258
Due after one year through five years	1,226
Due after five years through 10 years	2
Due after 10 years			$ 0
Marketable securities, Fair Value	$ 1,486	$ 1,255