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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 3,944	$ 1,545	$ 8,254	$ 4,724
Other Comprehensive Income Net of Taxes:
Net unrealized gain on derivatives, net of reclassifications	183	10	246	240
Benefit plan net gain and prior service credit, net of amortization	246	1,403	278	1,484
Cumulative translation adjustment	(387)	132	(422)	(167)
Other comprehensive income (loss), net of taxes	42	1,545	102	1,557
Comprehensive Income Attributable to Merck & Co., Inc.	$ 3,986	$ 3,090	$ 8,356	$ 6,281

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