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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES - MATURITIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash, Cash Equivalents, and Short-term Investments [Abstract]      
Sales and maturities of marketable securities $ 2,318 $ 1,674 $ 1,116
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]      
Due in one year or less 777    
Due after one year through five years 1,175    
Due after five years through 10 years 24    
Debt Securities, Available-for-sale, Total 1,976    
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]      
Due in one year or less 775    
Due after one year through five years 1,146    
Due after five years through 10 years 23    
Marketable securities $ 1,944