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CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net Income Attributable to Merck & Co., Inc.	$ 1,946	$ 1,205	$ 3,496	$ 2,330
Other Comprehensive Income (Loss) Net of Taxes:
Net unrealized loss on derivatives, net of reclassifications	(143)	(91)	(375)	(293)
Net unrealized gain on investments, net of reclassifications	35	63	78	126
Benefit plan net gain (loss) and prior service credit (cost), net of amortization	47	(108)	73	(136)
Cumulative translation adjustment	47	244	356	365
Other comprehensive income (loss), net of taxes	(14)	108	132	62
Comprehensive Income Attributable to Merck & Co., Inc.	$ 1,932	$ 1,313	$ 3,628	$ 2,392

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