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SUPPLEMENTAL FINANCIAL INFORMATION - Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 377			$ 367
Work in process	185			207
Finished goods	1,091			1,093
Inventories	$ 1,653	$ 1,756	$ 1,743	$ 1,667	$ 1,716	$ 1,616	$ 1,578