FAIR VALUE MEASUREMENTS - MATURITIES FOR MARKETABLE SECURITIES (Details) $ in Millions	Sep. 30, 2019 USD ($)
Cost Basis
Due in one year or less	$ 244
Due after one year through five years	1,105
Due after five years through 10 years	15
Total	1,364
Fair Value
Due in one year or less	244
Due after one year through five years	1,118
Due after five years through 10 years	15
Total	$ 1,377