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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Merck & Co., Inc.	$ 1,950	$ (56)	$ 4,393	$ 3,440
Other Comprehensive (Loss) Income Net of Taxes:
Net unrealized gain (loss) on derivatives, net of reclassifications	27	(66)	223	(441)
Net unrealized gain (loss) on investments, net of reclassifications	40	135	(56)	213
Benefit plan net gain and prior service credit, net of amortization	40	13	106	86
Cumulative translation adjustment	(136)	67	(240)	423
Other comprehensive income (loss), net of taxes	(29)	149	33	281
Comprehensive Income Attributable to Merck & Co., Inc.	$ 1,921	$ 93	$ 4,426	$ 3,721

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