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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value Disclosures [Line Items]      
Cash and cash equivalents $ 3,136 $ 3,730 $ 4,085
Other Assets      
Fair Value Disclosures [Line Items]      
Other equity investments without readily determinable fair values 108 105  
Significant other observable inputs (Level 2)      
Fair Value Disclosures [Line Items]      
Money market funds, at carrying value $ 1,400 $ 1,800