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SUPPLEMENTAL FINANCIAL INFORMATION - Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Raw materials $ 474 $ 460
Work in process 225 196
Finished goods 1,366 1,260
Inventories $ 2,065 $ 1,916