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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,551	$ 1,125
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(232)	(202)
Net unrealized gain on investments, net of reclassifications	43	63
Benefit plan net gain (loss) and prior service credit (cost), net of amortization	26	(28)
Cumulative translation adjustment	309	121
Other comprehensive income (loss), net of taxes	146	(46)
Comprehensive Income Attributable to Merck & Co., Inc.	$ 1,697	$ 1,079

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