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ACCRUED AND OTHER CURRENT LIABILITIES - Summary of Accrued and Other Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Legal matters and related fees $ 1,554 $ 1,672
Product rebates 890 747
Product returns 553 575
Interest 372 341
Employee compensation and benefit costs 279 316
Income taxes payable 132 158
Other 776 767
Accrued and other current liabilities $ 4,556 $ 4,576