FAIR VALUE MEASUREMENTS - MATURITIES FOR MARKETABLE SECURITIES (Details) $ in Millions	Mar. 31, 2019 USD ($)
Cost Basis
Due in one year or less	$ 217
Due after one year through five years	991
Due after five years through 10 years	11
Total	1,219
Fair Value
Due in one year or less	217
Due after one year through five years	993
Due after five years through 10 years	11
Total	$ 1,221