FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES - MATURITIES (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Available-for-sale Securities, Current [Abstract]
Due in one year or less	$ 113
Due after one year through five years	1,264
Due after five years through 10 years	50
Marketable securities	1,427	$ 1,252
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Due in one year or less	113
Due after one year through five years	1,272
Due after five years through 10 years	50
Marketable securities	$ 1,435