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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 736	$ 1,551
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(70)	(232)
Net unrealized (loss) gain on investments, net of reclassifications	(99)	43
Benefit plan net gain (loss) and prior service credit (cost), net of amortization	36	26
Cumulative translation adjustment	257	309
Other comprehensive income (loss), net of taxes	124	146
Comprehensive Income Attributable to Merck & Co., Inc.	$ 860	$ 1,697

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