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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,545	$ 3,002	$ 4,724	$ 6,221
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	10	(120)	240	(16)
Net unrealized loss on investments, net of reclassifications	0	0	0	(18)
Benefit plan net gain and prior service credit, net of amortization	1,403	39	1,484	99
Cumulative translation adjustment	132	79	(167)	(265)
Other comprehensive income (loss), net of taxes	1,545	(2)	1,557	(200)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 3,090	$ 3,000	$ 6,281	$ 6,021

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