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Equity (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]


			Three Months Ended September 30,
			Common Stock						Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock						Non- controlling Interests			Total
($ and shares in millions except per share amounts)			Shares			Par Value												Shares			Cost
Balance at July 1, 2019			3,577			$	1,788		$	39,484		$	45,295		$	(5,362)		1,010			$	(53,570)		$	102		$	27,737
Net income attributable to Merck & Co., Inc.			—			—			—			1,901			—			—			—			—			1,901
Other comprehensive loss, net of taxes			—			—			—			—			(28)			—			—			—			(28)
Cash dividends declared on common stock ($0.55 per share)			—			—			—			(1,392)			—			—			—			—			(1,392)
Treasury stock shares purchased			—			—			—			—			—			17			(1,405)			—			(1,405)
Share-based compensation plans and other			—			—			77			—			—			(1)			50			—			127
Net income attributable to noncontrolling interests			—			—			—			—			—			—			—			6			6
Distributions attributable to noncontrolling interests			—			—			—			—			—			—			—			(21)			(21)
Balance at September 30, 2019			3,577			$	1,788		$	39,561		$	45,804		$	(5,390)		1,026			$	(54,925)		$	87		$	26,925
Balance at July 1, 2020			3,577			$	1,788		$	39,373		$	49,724		$	(6,393)		1,048			$	(56,850)		$	102		$	27,744
Net income attributable to Merck & Co., Inc.			—			—			—			2,941			—			—			—			—			2,941
Other comprehensive income, net of taxes			—			—			—			—			10			—			—			—			10
Cash dividends declared on common stock ($0.61 per share)			—			—			—			(1,558)			—			—			—			—			(1,558)
Share-based compensation plans and other			—			—			116			—			—			(1)			35			—			151
Net income attributable to noncontrolling interests			—			—			—			—			—			—			—			4			4
Distributions attributable to noncontrolling interests			—			—			—			—			—			—			—			(22)			(22)
Balance at September 30, 2020			3,577			$	1,788		$	39,489		$	51,107		$	(6,383)		1,047			$	(56,815)		$	84		$	29,270


			Nine Months Ended September 30,
			Common Stock						Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Treasury Stock						Non- controlling Interests			Total
($ and shares in millions except per share amounts)			Shares			Par Value												Shares			Cost
Balance at January 1, 2019			3,577			$	1,788		$	38,808		$	42,579		$	(5,545)		985			$	(50,929)		$	181		$	26,882
Net income attributable to Merck & Co., Inc.			—			—			—			7,487			—			—			—			—			7,487
Other comprehensive income, net of taxes			—			—			—			—			155			—			—			—			155
Cash dividends declared on common stock ($1.65 per share)			—			—			—			(4,262)			—			—			—			—			(4,262)
Treasury stock shares purchased			—			—			1,000			—			—			54			(4,730)			—			(3,730)
Share-based compensation plans and other			—			—			(247)			—			—			(13)			734			—			487
Net loss attributable to noncontrolling interests			—			—			—			—			—			—			—			(73)			(73)
Distributions attributable to noncontrolling interests			—			—			—			—			—			—			—			(21)			(21)
Balance at September 30, 2019			3,577			1,788			39,561			45,804			(5,390)			1,026			(54,925)			87			26,925
Balance at January 1, 2020			3,577			$	1,788		$	39,660		$	46,602		$	(6,193)		1,038			$	(55,950)		$	94		$	26,001
Net income attributable to Merck & Co., Inc.			—			—			—			9,161			—			—			—			—			9,161
Other comprehensive loss, net of taxes			—			—			—			—			(190)			—			—			—			(190)
Cash dividends declared on common stock ($1.83 per share)			—			—			—			(4,656)			—			—			—			—			(4,656)
Treasury stock shares purchased			—			—			—			—			—			16			(1,281)			—			(1,281)
Share-based compensation plans and other			—			—			(171)			—			—			(7)			416			—			245
Net income attributable to noncontrolling interests			—			—			—			—			—			—			—			12			12
Distributions attributable to noncontrolling interests			—			—			—			—			—			—			—			(22)			(22)
Balance at September 30, 2020			3,577			$	1,788		$	39,489		$	51,107		$	(6,383)		1,047			$	(56,815)		$	84		$	29,270