Earnings per Share - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income from continuing operations	$ 323	$ 560	$ 1,149	$ 1,880
Income from discontinued operations	0	(13)	0	(88)
Net Income	$ 323	$ 547	$ 1,149	$ 1,792
Basic weighted average number of shares outstanding	253,534,000	253,516,000	253,530,000	253,516,000
Stock awards and equity units (share equivalent)	638,000	0	481,000	0
Diluted weighted average common shares outstanding	254,172,000	253,516,000	254,011,000	253,516,000
Earnings (Loss) per Share Attributable to Organon & Co. Stockholders - Basic:
Continuing operations (in dollars per share)	$ 1.27	$ 2.21	$ 4.53	$ 7.42
Loss from discontinued operations (in dollars per share)	0	(0.05)	0	(0.35)
Net Earnings per Share Attributable to Organon & Co. Stockholders - Basic (in dollars per share)	1.27	2.16	4.53	7.07
Earnings (Loss) per Share Attributable to Organon & Co. Stockholders - Diluted:
Continuing operations (in dollars per share)	1.27	2.21	4.52	7.42
Loss from discontinued operations (in dollars per share)	0	(0.05)	0	(0.35)
Net Earnings per Share Attributable to Organon & Co. Stockholders - Diluted (in dollars per share)	$ 1.27	$ 2.16	$ 4.52	$ 7.07