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Financial Instruments - Narrative (Details) € in Millions, $ in Millions	Mar. 31, 2025 EUR (€)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Accounts receivables factored | $		$ 249	$ 186
Minimum | Measurement Input, Discount Rate
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration discount rates	0.0626	0.0626
Maximum | Measurement Input, Discount Rate
Derivative Instruments, Gain (Loss) [Line Items]
Contingent consideration discount rates	0.0805	0.0805
Term Loan B Facility | Senior Notes
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt | €	€ 722
2.875% Senior Secured Notes Due 2028 | Senior Notes | Organon Finance 1 LLC
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of debt | €	€ 1,250
Stated interest rate	2.875%	2.875%
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount | $		$ 1,700	$ 1,400
Cross Currency Interest Rate Contract, Euro-Denominated Debt Instruments | 2034 Notes
Derivative Instruments, Gain (Loss) [Line Items]
Derivate fixed interest rate	5.833%	5.833%
Cross Currency Interest Rate Contract, Euro-Denominated Debt Instruments | Euro-Denominated Subsidiaries
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount | €	€ 922
Cross Currency Interest Rate Contract, U.S. Dollar-Denominated Debt Instruments | 2034 Notes
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount | $		$ 1,000
Derivate fixed interest rate	7.3125%	7.3125%

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