ACQUISITION - ALLOCATION OF PURCHASE PRICE (Details) - USD ($) $ in Millions		Dec. 31, 2018	Nov. 30, 2018	Jun. 30, 2018
Business Acquisition [Line Items]
Goodwill		$ 46,932		$ 45,175
PHC-MERCK ACQUISITION [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 393
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			122
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			2,111
Goodwill			2,010
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets			143
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			4,779
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities			233
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			661
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities			60
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities			954
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	[1]		169
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			$ 3,656

[1] Represents a 48% minority ownership interest in the Merck India company.