FAIR VALUE MEASUREMENTS - MATURITIES FOR MARKETABLE SECURITIES (Details) $ in Millions	Mar. 31, 2021 USD ($)
Cost Basis
Due in one year or less	$ 1,158
Due after one year through five years	1,231
Due after five years through 10 years	62
Total	2,451
Fair Value
Due in one year or less	1,159
Due after one year through five years	1,246
Due after five years through 10 years	61
Total	$ 2,466