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Equity

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Equity

Equity



	Three Months Ended June 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			Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Shares		Cost			Non- controlling Interests			Total
Balance at April 1, 2019	3,577		$	1,788		$	38,768		$	44,065		$	(5,346	)	994		$	(51,736	)	$	131		$	27,670
Net income attributable to Merck & Co., Inc.	—		—			—			2,670			—			—		—			—			2,670
Other comprehensive loss, net of taxes	—		—			—			—			(16		)	—		—			—			(16		)
Cash dividends declared on common stock ($0.55 per share)	—		—			—			(1,440		)	—			—		—			—			(1,440		)
Treasury stock shares purchased	—		—			1,000			—			—			24		(2,235		)	—			(1,235		)
Share-based compensation plans and other	—		—			(284		)	—			—			(8	)	401			—			117
Net loss attributable to noncontrolling interests	—		—			—			—			—			—		—			(26		)	(26		)
Other changes in noncontrolling interests	—		—			—			—			—			—		—			(3		)	(3		)
Balance at June 30, 2019	3,577		$	1,788		$	39,484		$	45,295		$	(5,362	)	1,010		$	(53,570	)	$	102		$	27,737
Balance at April 1, 2020	3,577		$	1,788		$	39,697		$	48,272		$	(6,391	)	1,053		$	(57,161	)	$	95		$	26,300
Net income attributable to Merck & Co., Inc.	—		—			—			3,002			—			—		—			—			3,002
Other comprehensive loss, net of taxes	—		—			—			—			(2		)	—		—			—			(2		)
Cash dividends declared on common stock ($0.61 per share)	—		—			—			(1,550		)	—			—		—			—			(1,550		)
Share-based compensation plans and other	—		—			(324		)	—			—			(5	)	311			—			(13		)
Net income attributable to noncontrolling interests	—		—			—			—			—			—		—			8			8
Distributions attributable to noncontrolling interests	—		—			—			—			—			—		—			(1		)	(1		)
Balance at June 30, 2020	3,577		$	1,788		$	39,373		$	49,724		$	(6,393	)	1,048		$	(56,850	)	$	102		$	27,744



	Six Months Ended June 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			Other Paid-In Capital			Retained Earnings			Accumulated Other Comprehensive Loss			Shares		Cost			Non- controlling Interests			Total
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.	—		—			—			5,585			—			—		—			—			5,585
Other comprehensive income, net of taxes	—		—			—			—			183			—		—			—			183
Cash dividends declared on common stock ($1.10 per share)	—		—			—			(2,869		)	—			—		—			—			(2,869		)
Treasury stock shares purchased	—		—			1,000			—			—			38		(3,325		)	—			(2,325		)
Share-based compensation plans and other	—		—			(324		)	—			—			(13	)	684			—			360
Net loss attributable to noncontrolling interests	—		—			—			—			—			—		—			(79		)	(79		)
Balance at June 30, 2019	3,577		$	1,788		$	39,484		$	45,295		$	(5,362	)	1,010		$	(53,570	)	$	102		$	27,737
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.	—		—			—			6,221			—			—		—			—			6,221
Other comprehensive loss, net of taxes	—		—			—			—			(200		)	—		—			—			(200		)
Cash dividends declared on common stock ($1.22 per share)	—		—			—			(3,099		)	—			—		—			—			(3,099		)
Treasury stock shares purchased	—		—			—			—			—			16		(1,281		)	—			(1,281		)
Share-based compensation plans and other	—		—			(287		)	—			—			(6	)	381			—			94
Net income attributable to noncontrolling interests	—		—			—			—			—			—		—			8			8
Balance at June 30, 2020	3,577		$	1,788		$	39,373		$	49,724		$	(6,393	)	1,048		$	(56,850	)	$	102		$	27,744