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REVENUES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Change in estimate of variable consideration $ 188 $ 13 $ 661 $ 94  
Contract assets 167   167   $ 198
Contract liabilities 85   85   $ 97
Royalty          
Disaggregation of Revenue [Line Items]          
Contract with customer, performance obligation satisfied in previous period $ 190 $ 206 $ 625 $ 618