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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 4,310	$ 3,179
Other Comprehensive Income Net of Taxes:
Net unrealized gain on derivatives, net of reclassifications	63	230
Benefit plan net gain and prior service credit, net of amortization	32	81
Cumulative translation adjustment	(35)	(299)
Other comprehensive income (loss), net of taxes	60	12
Comprehensive Income Attributable to Merck & Co., Inc.	$ 4,370	$ 3,191

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