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Financial Instruments - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
Financial Instruments - Narrative (Details) $ in Millions	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Jun. 02, 2021 EUR (€)	Apr. 30, 2021 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items]
Fair value hedge assets	$ 7		$ 7
Fair value hedge liabilities	16		16
Accounts receivables factored	31
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount	$ 1,700		$ 1,700
Merck and Co., Inc.
Derivative Instruments, Gain (Loss) [Line Items]
Accounts receivables factored		$ 227
Senior Notes \| Organon Finance 1 LLC
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt (in euros) \| €						€ 1,250,000,000
Euro Denominated Term Loan B \| Senior Notes
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt (in euros) \| €				€ 750,000,000	€ 750,000,000
2.875% Senior Secured Notes Due 2028 \| Senior Notes \| Organon Finance 1 LLC
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt (in euros) \| €				€ 1,250,000,000
Stated interest rate	2.875%		2.875%	2.875%		2.875%
Euro Denominated Term Loan \| Senior Notes
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt (in euros) \| €				€ 1,750,000,000
Gain on derivative	$ 38		$ 94