Equity (Tables)

6 Months Ended

Jun. 30, 2023

Equity [Abstract]

Schedule of 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								Shares	Cost
Balance at April 1, 2022	3,577	$	1,788	$	44,275	$	56,252	$	(4,369)	1,049	$	(57,063)	$	70	$	40,953
Net income attributable to Merck & Co., Inc.	—	—		—		3,944		—		—	—		—		3,944
Other comprehensive income, net of taxes	—	—		—		—		42		—	—		—		42
Cash dividends declared on common stock ($0.69 per share)	—	—		—		(1,759)		—		—	—		—		(1,759)
Share-based compensation plans and other	—	—		(160)		—		—		(5)	293		—		133
Net income attributable to noncontrolling interests	—	—		—		—		—		—	—		5		5
Balance at June 30, 2022	3,577	$	1,788	$	44,115	$	58,437	$	(4,327)	1,044	$	(56,770)	$	75	$	43,318
Balance at April 1, 2023	3,577	$	1,788	$	44,467	$	62,039	$	(4,883)	1,040	$	(56,577)	$	71	$	46,905
Net loss attributable to Merck & Co., Inc.	—	—		—		(5,975)		—		—	—		—		(5,975)
Other comprehensive loss, net of taxes	—	—		—		—		(17)		—	—		—		(17)
Cash dividends declared on common stock ($0.73 per share)	—	—		—		(1,866)		—		—	—		—		(1,866)
Treasury stock shares purchased	—	—		—		—		—		3	(338)		—		(338)
Share-based compensation plans and other	—	—		(248)		—		—		(5)	303		—		55
Net income attributable to noncontrolling interests	—	—		—		—		—		—	—		3		3
Distributions attributable to noncontrolling interests	—	—		—		—		—		—	—		(25)		(25)
Balance at June 30, 2023	3,577	$	1,788	$	44,219	$	54,198	$	(4,900)	1,038	$	(56,612)	$	49	$	38,742

	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								Shares	Cost
Balance at January 1, 2022	3,577	$	1,788	$	44,238	$	53,696	$	(4,429)	1,049	$	(57,109)	$	73	$	38,257
Net income attributable to Merck & Co., Inc.	—	—		—		8,254		—		—	—		—		8,254
Other comprehensive income, net of taxes	—	—		—		—		102		—	—		—		102
Cash dividends declared on common stock ($1.38 per share)	—	—		—		(3,513)		—		—	—		—		(3,513)
Share-based compensation plans and other	—	—		(123)		—		—		(5)	339		—		216
Net income attributable to noncontrolling interests	—	—		—		—		—		—	—		2		2
Balance at June 30, 2022	3,577	$	1,788	$	44,115	$	58,437	$	(4,327)	1,044	$	(56,770)	$	75	$	43,318
Balance at January 1, 2023	3,577	$	1,788	$	44,379	$	61,081	$	(4,768)	1,039	$	(56,489)	$	67	$	46,058
Net loss attributable to Merck & Co., Inc.	—	—		—		(3,154)		—		—	—		—		(3,154)
Other comprehensive loss, net of taxes	—	—		—		—		(132)		—	—		—		(132)
Cash dividends declared on common stock ($1.46 per share)	—	—		—		(3,729)		—		—	—		—		(3,729)
Treasury stock shares purchased	—	—		—		—		—		4	(487)		—		(487)
Share-based compensation plans and other	—	—		(160)		—		—		(5)	364		—		204
Net income attributable to noncontrolling interests	—	—		—		—		—		—	—		7		7
Distributions attributable to noncontrolling interests	—	—		—		—		—		—	—		(25)		(25)
Balance at June 30, 2023	3,577	$	1,788	$	44,219	$	54,198	$	(4,900)	1,038	$	(56,612)	$	49	$	38,742